Clamp-o-Tron's Core Modpack

for Kerbal Space Program, from ClampOTron

This is a pack designed to provide a fresh, challenging career mode play experience to people who aren't afraid of a little grind, complexity, failiure, or installing and maintaining hundreds of mods. It draws on stockalike parts packs like Tantares and BDB to give more options to the player, while simultaneously making the game much harder with stuff like JNSQ, Kerbalism, and Engine Ignitor.

System Requirements:
I run this quite well (usually yellow or green clock in flight) with 24 Gb RAM and i5-9400 2.9 GHz. The loading times are awful though because I don't have a good SSD :).
Higher than this could probably run it quite smoothly. If you've got lower than this, uninstalling some of the pretties might help.

Ideal progression:
This modpack is designed to give a smooth progression from aviation to sounding rockets to probes to crew to reusable rockets to alternative means of propulsion to colonies. Personally my favorite time in a career game is when the the largest dependable rocket is a Titan III or something, so it'll dwell there for a while. If you want to change stuff, just uninstall/install mods at will.

Mods not on Spacedock:
(Does not include dependencies. Get them yourself.)
Textures Unlimited
Astrogator
B9 Part Switch
BetterSRBs
Bureacracy
Community Category Kit
Contract Configurator
Exploration Plus
Bases and Stations Contract Pack
Tourism Plus Contract Pack
Craft Manager
Custom Barn Kit
Custom Bulkhead Profiles
Earn Your Stripes
EasyBoard
EVE-Redux
Extraplanetary Launchpads
FAR
HTrobotics
KerbalEngineer
Kerbal Joint Reinforcement Kiwi Tech Tree
Kopernicus
KSP-AVC
memgraph
PlanetShine
ProjectManager
Provenance Aerospace
RealChute
Strategia
TUFX (with Zorg's configs)
Universal Storage 2
Waypoint Manager
Engine Ignitor

Some mods may have limited functionality because they don't have some of my own patches. This however should be no problem to fix.
3.2.9 for KSP 1.12.5

Filter Extensions

Filter Extensions allows the usage of .cfg files to create, edit, or delete all categories and sub-categories

Filter Extensions

1.0.5.2 for KSP 1.12.3

Moar Filter Extension Configs

This package of configs will add additional filters to the VAB and SPH. The size filters range from 0.35 to 30 meters. ** Filter Extensions mod REQUIRED**

Moar Filter Extension Configs

26.5 for KSP 1.8.1

Airplane Plus

Adds plane parts. Images are on the album.

Airplane Plus

1.3.3.4 for KSP 1.12.5

Blast Awesomeness Modifier (BAM)

Adjusts the explosion power (and effect) of each part based on its resources.

Blast Awesomeness Modifier (BAM)

1.1.8 for KSP 1.12.3

Shuttle Orbiter Construction Kit

Stockalike parts for NASA's Space Shuttle Orbiter.

Shuttle Orbiter Construction Kit

1.10 for KSP 1.12.3

BetterBurnTime

Extra, automatic burn-time indicators for suicide burns & target rendezvous.

BetterBurnTime

2.3.13 for KSP 1.12.5

BetterTimeWarpContinued

Improved time warping

BetterTimeWarpContinued

v1.14.0 for KSP 1.12.5

Bluedog Design Bureau

Adds stockalike Apollo, Saturn, Titan, Atlas and many many other things besides

Bluedog Design Bureau

1.4.1 for KSP 1.12.3

BonVoyage

Make your wheels rolling and ships rowing

BonVoyage

0.9.99 for KSP 1.12.4

Chatterer

A plugin for Kerbal Space Program which adds some SSTV, beeps, and nonsensical radio chatter between your command pods and Mission Control.

Chatterer

0.6.2 for KSP 1.4.2

Chatterer Extended

This add-on for the formidable "Chatterer" mod by Athlonic will currently add 625 new kerbalized chatter-files for your hearing pleasure.

Chatterer Extended

1.0.2 for KSP 1.8.1

Completely Non-Aggressive Rocketry (CNAR)

Adds the V2 and Bumper rockets to the game.

Completely Non-Aggressive Rocketry (CNAR)

1.4.1.0 for KSP 1.3.1

Community Resource Pack

A collection of shared resources for better mod interoperability!

Community Resource Pack

3.4.5 for KSP 1.12.5

Community Tech Tree

Community Tech Tree expands the stock technology tree to accommodate many community mods in an inclusive and extensible manner

Community Tech Tree

0.2.14 for KSP 1.12.5

Conformal Decals

Add decals to any surface

Conformal Decals

1.0 for KSP 1.3.0

Career Evolution Contract Pack

Contract Pack that takes the player from uncrewed launches like sounding rockets, to the first satellite into crewed launches that explore the solar system.

Career Evolution Contract Pack

1.1.11.4 for KSP 1.12.5

Crew R&R

This mod is focused around the idea of encouraging the player to keep a deeper roster of crew, and to increase the value of individual experienced crew.

Crew R&R

2.0.7 for KSP 1.12.5

Cryogenic Engines

High efficiency chemical engines

Cryogenic Engines

0.8.1 for KSP 1.12.5

Decoupler Shroud

Dynamic Shrouds to cover engines

Decoupler Shroud

2.2.0.2 for KSP 1.12.5

Distant Object Enhancement /L

Distant Object Enhancement (Continued) /L is a visual enhancement mod that makes objects realistically visible over large distances.

Distant Object Enhancement /L

1.4.3 for KSP 1.8.1

DMagic Orbital Science

New science parts and experiments

DMagic Orbital Science

2.3 for KSP 1.12.1

Easy Vessel Switch

The stock game doesn't offer a consistent model of the camera positioning when the active vessel is switched. The EVS does. Now, your camera won't jump randomly as you switch between the vessels, and you can select which vessel to activate with the mouse click!

Easy Vessel Switch

3.4.5 for KSP 1.12.5

Editor Extensions Redux

Tweaks and features for the in-game vessel editor, e.g. alignment and symmetry aids. Now includes SelectRoot mod

Editor Extensions Redux

1.6.8 for KSP 1.9.1

EVAFuel Continued

No more infinite EVA Fuel!

EVAFuel Continued

1.2.9.5 for KSP 1.12.5

Flight Manager for Reusable Stages (FMRS) Continued

FMRS lets you jump back and forth in time. It generates save points after separating controllable probes, ship, landers, ...

Flight Manager for Reusable Stages (FMRS) Continued

3.6.0.2 for KSP 1.12.5

HangarExtender

Extend your VAB/SPH so you can build really massive rockets

HangarExtender

1.4 for KSP 1.12.5

Fuji

Fuji (ふじ) was a crewed spacecraft of the space capsule kind, proposed by Japan's National Space Development Agency (NASDA) Advanced mission Research center in December 2001.

Fuji

5.0 for KSP 1.7.2

Grounded - Modular Vehicles

Makes it possible to make cars, trucks, vans as how you want them with modular parts.

Grounded - Modular Vehicles

1.0.0 for KSP 1.12.5

HabTech2

HabTech2 is a complete revamp of my previous ISS Parts mod, HabTech. Contains parts emulating the US modules of the International Space Station and more.

HabTech2

0.6.2 for KSP 1.12.5

Heat Control

This part pack is designed to provide players with more flexibility when dissipating heat on their vessels

Heat Control

1.2 for KSP 1.11.0

ULA Vulcan

This mod is a stand-alone expansion to BDB that allows you to build the ULA Vulcan rocket

ULA Vulcan

1.3.2 for KSP 1.12.3

Hide Empty Tech Tree Nodes

Hides any tech tree nodes that don't have parts and reassigns parent-node connections so that non-empty nodes have only non-empty parents. To be used with modded tech trees.

Hide Empty Tech Tree Nodes

0.2.2.1 for KSP 1.12.5

HullcamVDS Continued

Many types of cameras for vessels

HullcamVDS Continued

0.1 for KSP 1.4.3

DRElite

Magic heat shields that work with zero ablator remaining are annoying. These ones don't.

DRElite

1.3 for KSP 1.12.3

Internal RCS

RCS thrusters without encasement. Cut at 90, 60, 45 and 30 degrees, that can be placed everywhere on your spaceship and not harm aerodynamics.

Internal RCS

0.3.9 for KSP 1.12.5

The Janitor's Closet

Get your parts list under control

The Janitor's Closet

1.12 for KSP 1.12.3

Kerbal Attachment System (KAS)

Allows linking separate vessels without cooking them for the purposes of towing, lifting or resources transfer.

Kerbal Attachment System (KAS)

1.3.4 for KSP 1.12.5

Kerbal Atomics

Fancy nuclear engines for fun and profit

Kerbal Atomics

1.4.12 for KSP 1.12.5

Kerbal Construction Time

Unrapid Planned Assembly

Kerbal Construction Time

3.17 for KSP 1.12.5

Kerbalism

Add life support, quality-of-life, radiation, malfunctions, signals and space weather mechanics.

Kerbalism

3.17 for KSP 1.12.5

KerbalismConfig

Default configuration for the Kerbalism mod.

KerbalismConfig

03Aug21 for KSP 1.12.2

Kerbalized National Flags and Space Agencies

Kerbalized National and Regional flags. Space Agencies for the Contract window. Decal Textures for a wide variety of uses. Links to required mods below.

Kerbalized National Flags and Space Agencies

1.8.1.15 for KSP 1.8.1

Kerbal-Konstructs

Kerbal Konstructs for KSP 1.2 and onwards

Kerbal-Konstructs

2.9.3 for KSP 1.12.5

Kerbal Reusability Expansion

KRE - A collection of parts to make your rockets reusable.

Kerbal Reusability Expansion

1.0.1 for KSP 1.9.0

Kerbin Side Remastered

A new remade Kerbin Side!

Kerbin Side Remastered

1.29 for KSP 1.12.3

Kerbal Inventory System (KIS)

KIS introduces new gameplay mechanics by adding a brand new inventory system and EVA usables items as tools. You want to build a rover on Duna from scratch? Or you've forgot to attach a solar panel to the planetary station? With KIS it's not a problem!

Kerbal Inventory System (KIS)

v1.9.9 for KSP 1.12.5

Knes

Stockalike Parts Mods in european style - Ariane 5 / Hermes / IXV / CEV and more

Knes

v1.4.0.0 for KSP 1.12.5

kOS: Scriptable Autopilot System

Fully programmable autopilot mod for KSP

kOS: Scriptable Autopilot System

0.5.2 for KSP 1.9.1

Kourageous Tourists

Tiny mod making tourists less helpless

Kourageous Tourists

0.5.34 for KSP 1.12.5

KRASH - Kerbal Ramification Artifical Simulation Hub (simulation mod for KSP)

Simulation mod

KRASH - Kerbal Ramification Artifical Simulation Hub (simulation mod for KSP)

0.1.1 for KSP 1.9.1

Kronal Vessel Viewer Continued

Plugin that creates blue-print-like images (into your Screenshots/ directory) from the KSP Editor (VAB/SPH).

Kronal Vessel Viewer Continued

1.9 for KSP 1.12.5

Luciole

Parts Mod 0.625 Launcher

Luciole

1.10.1 for KSP 1.10.1

Making Alternate History

Lander pack based on the alternate history universe of Eyes Turned Skyward

Making Alternate History

1.8 for KSP 1.8.1

MandatoryRCS

Plugin that balance reaction wheels to make RCS mandatory, also add SAS & rotation persistence (timewarp don't stop rotation)

MandatoryRCS

5.0 for KSP 1.8.1

Maneuver Node Evolved

An improved version of the stock maneuver node tool.

Maneuver Node Evolved

3.2.1 for KSP 1.12.5

Mark IV Spaceplane System

Wide-body, massive spaceplane fuselage including advanced engines

Mark IV Spaceplane System

2.7.0 for KSP 1.12.5

AlphaMensae's Modular Launch Pads

Beyond launch clamps: Mix-and-match components to build all kinds of launch infrastructure

AlphaMensae's Modular Launch Pads

6.10.0.0 for KSP 1.12.2

Docking Port Alignment Indicator

The Docking Port Alignment Indicator is designed to help you dock manually, by presenting target alignment and relative position in a clean and intuitive manner.

Docking Port Alignment Indicator

2.1.2 for KSP 1.12.5

Near Future Aeronautics

Advanced aircraft engines and accessories

Near Future Aeronautics

1.3.3 for KSP 1.12.5

Near Future Construction

Trusses and other structural parts for constructing exciting bases and ships

Near Future Construction

2.0.1 for KSP 1.12.5

Near Future Electrical

Nuclear reactors and power systems

Near Future Electrical

1.1.3 for KSP 1.12.5

Near Future Exploration

New and exciting probe and satellite parts

Near Future Exploration

2.2.1 for KSP 1.12.5

Near Future Launch Vehicles

Super-heavy lifter parts

Near Future Launch Vehicles

1.3.6 for KSP 1.12.5

Near Future Propulsion

Ion and plasma engines with two new fuels!

Near Future Propulsion

1.3.3 for KSP 1.12.5

Near Future Solar

New and varied solar panel options for your craft

Near Future Solar

1.4.5 for KSP 1.12.5

Near Future Spacecraft

Stylish spacecraft parts in a stockalike style

Near Future Spacecraft

1.8.2 for KSP 1.11.0

Stockish Project Orion

Orion drive and Orion drive-adjacent parts for KSP

Stockish Project Orion

0.0.12 for KSP 1.6.1

Omega's Stockalike Structures: No Textures Required

ALPHA BUILD. A statics content pack for KERBAL KONSTRUCTS

Omega's Stockalike Structures: No Textures Required

1.6.16 for KSP 1.12.3

Kerbal Planetary Base Systems

KPBS adds multiple parts for bases on other planets including Habitats, Greenhouses, Laboratories and much more. It also supports the major life support mods.

Kerbal Planetary Base Systems

18.0 for KSP 1.8.1

Portrait Stats

Displays the type and level of each Kerbal over their portrait in the lower-right corner during flight.

Portrait Stats

3.0.2 for KSP 1.12.5

Rational Resources

Makes resource placement no longer random but fit to composition templates. Promotes cryofuel mods and planet pack to life support compatibility.

Rational Resources

0.10.0 for KSP 1.8.1

RCS Build Aid Continued

Assists in placing RCS thrusters in the right positions in the first try without having to go back and forth between the VAB and the hacked gravity launchpad.

RCS Build Aid Continued

v4.0.8 for KSP 1.12.1

RealPlume - Stock

RealPlume, originally developed for Realism Overhaul enables great looking plumes that display realistic behavior by expanding with lower atmospheric pressure. This mod brings RealPlume to stock parts and to various stock-alike mods. With Nhawks17 blessing, this is a continuation of RealPlume-Stock.

RealPlume - Stock

0.10.1 for KSP 1.8.1

reDIRECT

Shuttle-derived heavy lift vehicles for Kerbal Space Program.

reDIRECT

1.9.1.1 for KSP 1.12.3

Reentry Particle Effect Renewed

This mod adds code to display an unused stock particle effect for reentry, featuring a plasma trail and sparks.

Reentry Particle Effect Renewed

V1.13.0 for KSP 1.12.3

ResearchBodies

ResearchBodies is a mod that adds the functionality of hiding celestial bodies and requiring you to find and track celestial bodies to explore them.

ResearchBodies

1.5.1 for KSP 1.12.5

Restock

Revamping KSP's art

Restock

1.5.1 for KSP 1.12.5

RestockPlus

Additional parts - an extension to the Restock project

RestockPlus

v20.4 for KSP 1.10.1

SCANsat

SCANsat: Real Scanning, Real Science, Warp Speed!

SCANsat

6.0.8.0 for KSP 1.12.5

ShipManifest

Ship Manifest is a tool to manage your ship's "things".

ShipManifest

0.0878 for KSP 1.12.5

Scatterer

Atmospheric scattering shaders

Scatterer

4.7.1.8 for KSP 1.12.5

Soundtrack Editor Forked

This mod allows you to add and remove music from the game, and set up playlists which decide when each song plays

Soundtrack Editor Forked

1.0 for KSP 1.12.2

Original Score Project

Over two hours of composed music for KSP

Original Score Project

1.6.1 for KSP 1.12.5

Speed Unit Annex

Add (annex) some new speed unit and helpful value to the navball's top line, depending from navball mode and vesselType.

Speed Unit Annex

2.0.11 for KSP 1.12.5

Stockalike Station Parts Expansion Redux

A comprehensive and pretty set of station parts

Stockalike Station Parts Expansion Redux

v7.13 for KSP 1.12.2

Tarsier Space Technology with Galaxies Continued...

Tarsier Space Technology - Space Telescopes, Galaxies, ChemCam surface analyser, Science Storage Drives and Contracts

Tarsier Space Technology with Galaxies Continued...

2.0.4.4 for KSP 1.12.5

Through The Eyes of a Kerbal

View the world through the eyes of a Kerbal

Through The Eyes of a Kerbal

1.1.6.6 for KSP 1.12.5

TooManyOrbits

This mod lets you hide orbits with the press of a single key and clears up the map view so you can concentrate on your mission.

TooManyOrbits

7.0 for KSP 1.12.2

Tracking Station Evolved

An addon to improve the tracking station vessel selection list.

Tracking Station Evolved

2.4.5.3 for KSP 1.12.5

Trajectories

The mod displays trajectory predictions, accounting for atmospheric drag, lift, etc. Works with the stock aerodynamic model, and also with Ferram Aerospace Research (FAR).

Trajectories

3.14.0.0 for KSP 1.12.3

Kerbal Alarm Clock

A plugin that allows you to create reminder alarms at future periods to help you manage your flights and not warp past important times

Kerbal Alarm Clock

7.0.0 for KSP 1.12.5

Tundra Exploration - Stockalike Dragon V2 and Falcon 9

This is a mod that adds SpaceX parts like the Dragon V2, Falcon 9 and more!

Tundra Exploration - Stockalike Dragon V2 and Falcon 9

2.0.2 for KSP 1.12.3

Tundra's Space Center

A mod that is focusing on the next generation launchpads for Kerbal Konstruct.

Tundra's Space Center

0.7.3.3 for KSP 1.12.5

WasdEditorCameraContinued

WasdEditorCameraContinued

WasdEditorCameraContinued

1.3.2 for KSP 1.12.5

Mk-33

Parts inspired by the X-33/VentureStar

Mk-33

0.9.7-ksp-1.8.1 for KSP 1.8.1

WorldStabilizer

Bugfix for vessels bouncing on scene load

WorldStabilizer

1.3 for KSP 1.12.5

Ж-20 "Moroz" Spaceplane

Ж-20 "Moroz" Spaceplane is a KSP variant of the X-20 Dynasoar Spaceplane

Ж-20 "Moroz" Spaceplane

3.0.1.0 for KSP 1.10.1

FullAutoStrut

Automatically sets AutoStrut modes for you in the editor as you build your vessel. Includes compatibility for Infernal Robotics, FAS will not set AutoStrut mode if the part is attached to an IR module.

FullAutoStrut

1.1.3.2 for KSP 1.12.5

ZeroMiniAVC

A small plugin which disable and prune all MiniAVC added by others mods.

ZeroMiniAVC

2.0.3.1 for KSP 1.8.1

SimpleLogistics

A simple mod for sharing resources between vessels within physics range.

SimpleLogistics

0.5.13.1 for KSP 1.12.5

Wernher Checker Continued

Checklist

Wernher Checker Continued