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.

3.2.6 for Kerbal Space Program 1.10.1

Filter Extensions

1.0.5.2 for Kerbal Space Program 1.10.1

Moar Filter Extension Configs

26.5 for Kerbal Space Program 1.8.1

Airplane Plus

1.3.3.3 for Kerbal Space Program 1.8.1

Blast Awesomeness Modifier (BAM)

1.1.2b for Kerbal Space Program 1.10.0

Shuttle Orbiter Construction Kit

Download
Stockalike parts for NASA's Space Shuttle Orbiter.

Shuttle Orbiter Construction Kit

1.10 for Kerbal Space Program 1.10.1

BetterBurnTime

2.3.12.6 for Kerbal Space Program 1.9.1

BetterTimeWarpContinued

Download
Improved time warping

BetterTimeWarpContinued

v1.7.1 for Kerbal Space Program 1.10.1

Bluedog Design Bureau

1.2.0 for Kerbal Space Program 1.10.1

BonVoyage

0.6.2 for Kerbal Space Program 1.4.2

Chatterer Extended

1.0.2 for Kerbal Space Program 1.8.1

Completely Non-Aggressive Rocketry (CNAR)

Download
Adds the V2 and Bumper rockets to the game.

Completely Non-Aggressive Rocketry (CNAR)

1.4.1.0 for Kerbal Space Program 1.3.1

Community Resource Pack

0.2.5 for Kerbal Space Program 1.10.1

Conformal Decals

Download
Add decals to any surface

Conformal Decals

1.0 for Kerbal Space Program 1.3.0

Career Evolution Contract Pack

1.1.4 for Kerbal Space Program 1.10.1

Cryogenic Engines

Download
High efficiency chemical engines

Cryogenic Engines

0.7.2 for Kerbal Space Program 1.8.1

Decoupler Shroud

Download
Dynamic Shrouds to cover engines

Decoupler Shroud

1.1 for Kerbal Space Program 1.10.1

Special Delivery - Stockalike Cygnus

Download
A small parts mod adding a Cygnus spacecraft.

Special Delivery - Stockalike Cygnus

v2.0.1.1 for Kerbal Space Program 1.10.1

Distant Object Enhancement Continued

1.4.3 for Kerbal Space Program 1.8.1

DMagic Orbital Science

Download
New science parts and experiments

DMagic Orbital Science

3.4.1.1 for Kerbal Space Program 1.10.1

Editor Extensions Redux

1.6.8 for Kerbal Space Program 1.9.1

EVAFuel Continued

Download
No more infinite EVA Fuel!

EVAFuel Continued

1.2.9.1 for Kerbal Space Program 1.8.1

Flight Manager for Reusable Stages (FMRS) Continued

3.6.0 for Kerbal Space Program 1.10.1

HangerExtender

5.0 for Kerbal Space Program 1.7.2

Grounded - Modular Vehicles

0.5.2 for Kerbal Space Program 1.10.1

Heat Control

1.1 for Kerbal Space Program 1.10.1

ULA Vulcan

0.2.0.1 for Kerbal Space Program 1.10.1

HullcamVDS Continued

Download
Many types of cameras for vessels

HullcamVDS Continued

0.1 for Kerbal Space Program 1.4.3

ImprovedHeatShields

0.3.7 for Kerbal Space Program 1.9.0

The Janitor's Closet

Download
Get your parts list under control

The Janitor's Closet

1.7 for Kerbal Space Program 1.10.1

Kerbal Attachment System (KAS)

1.1.4 for Kerbal Space Program 1.10.1

Kerbal Atomics

1.4.8 for Kerbal Space Program 1.10.1

Kerbal Construction Time

Download
Unrapid Planned Assembly

Kerbal Construction Time

3.9 for Kerbal Space Program 1.9.1

Kerbalism

3.9 for Kerbal Space Program 1.9.1

KerbalismConfig

4.0.4.1 for Kerbal Space Program 1.10.1

Kerbalized National Flags and Space Agencies

1.8.1.15 for Kerbal Space Program 1.8.1

Kerbal-Konstructs

Download
Kerbal Konstructs for KSP 1.2 and onwards

Kerbal-Konstructs

2.8.6 for Kerbal Space Program 1.10.0

Kerbal Reusability Expansion

Download
A collection of parts to make your rockets reusable.

Kerbal Reusability Expansion

1.0.1 for Kerbal Space Program 1.9.0

Kerbin Side Remastered

Download
A new remade Kerbin Side!

Kerbin Side Remastered

1.8.2 for Kerbal Space Program 1.10.1

Knes

v1.2.1.0-reuploaded for Kerbal Space Program 1.8.1

kOS: Scriptable Autopilot System

Download
Fully programmable autopilot mod for KSP

kOS: Scriptable Autopilot System

0.5.2 for Kerbal Space Program 1.9.1

Kourageous Tourists

Download
Tiny mod making tourists less helpless

Kourageous Tourists

0.5.33.2 for Kerbal Space Program 1.10.1

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

Download
Simulation mod

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

0.1.1 for Kerbal Space Program 1.9.1

Kronal Vessel Viewer Continued

Luciole_1.5 for Kerbal Space Program 1.10.1

Luciole

Download
Parts Mod 0.625 Launcher

Luciole

1.10.1 for Kerbal Space Program 1.10.1

Making Alternate History

5.0 for Kerbal Space Program 1.8.1

Maneuver Node Evolved

3.1.2 for Kerbal Space Program 1.10.1

Mark IV Spaceplane System

2.1.2 for Kerbal Space Program 1.10.1

AlphaMensae's Modular Launch Pads

6.9.1 for Kerbal Space Program 1.10.0

Docking Port Alignment Indicator

2.0.0 for Kerbal Space Program 1.10.1

Near Future Aeronautics

Download
Advanced aircraft engines and accessories

Near Future Aeronautics

1.2.3 for Kerbal Space Program 1.10.1

Near Future Construction

1.1.3 for Kerbal Space Program 1.10.1

Near Future Electrical

Download
Nuclear reactors and power systems

Near Future Electrical

1.0.10 for Kerbal Space Program 1.10.1

Near Future Exploration

Download
New and exciting probe and satellite parts

Near Future Exploration

2.0.3 for Kerbal Space Program 1.10.1

Near Future Launch Vehicles

Download
Super-heavy lifter parts

Near Future Launch Vehicles

1.2.2 for Kerbal Space Program 1.10.1

Near Future Propulsion

Download
Ion and plasma engines with two new fuels!

Near Future Propulsion

1.2.3 for Kerbal Space Program 1.10.1

Near Future Solar

1.3.3 for Kerbal Space Program 1.10.1

Near Future Spacecraft

Download
Stylish spacecraft parts in a stockalike style

Near Future Spacecraft

1.8.1 for Kerbal Space Program 1.10.0

Stockish Project Orion

0.0.12 for Kerbal Space Program 1.6.1

Omega's Stockalike Structures: No Textures Required

Download
ALPHA BUILD. A statics content pack for KERBAL KONSTRUCTS

Omega's Stockalike Structures: No Textures Required

1.6.12 for Kerbal Space Program 1.10.1

Kerbal Planetary Base Systems

18.0 for Kerbal Space Program 1.8.1

Portrait Stats

0.10.1 for Kerbal Space Program 1.8.1

reDIRECT

1.9.1.1 for Kerbal Space Program 1.10.1

Reentry Particle Effect Renewed

1.2.1 for Kerbal Space Program 1.10.1

Restock

Download
Revamping KSP's art

Restock

1.2.1 for Kerbal Space Program 1.10.1

RestockPlus

v20.4 for Kerbal Space Program 1.10.1

SCANsat

6.0.1.0 for Kerbal Space Program 1.10.0

ShipManifest

0.0632 for Kerbal Space Program 1.10.1

scatterer

4.6.1.2 for Kerbal Space Program 1.7.3

Soundtrack Editor Forked

1.0 for Kerbal Space Program 1.9.1

Original Score Project

Download
Over two hours of composed music for KSP

Original Score Project

1.3.7 for Kerbal Space Program 1.10.1

Speed Unit Annex

1.3.6 for Kerbal Space Program 1.10.1

Stockalike Station Parts Expansion Redux

Download
A comprehensive and pretty set of station parts

Stockalike Station Parts Expansion Redux

23.2 for Kerbal Space Program 1.10.1

Tantares - Stockalike Soyuz and MIR

Download
Stockalike Soviet Spacecraft.

Tantares - Stockalike Soyuz and MIR

13.1 for Kerbal Space Program 1.10.1

TantaresLV - Stockalike Launch Vehicles

Download
Stockalike Soviet and European Launch Vehicles.

TantaresLV - Stockalike Launch Vehicles

3.0 for Kerbal Space Program 1.10.1

TantaresSP

v7.11 for Kerbal Space Program 1.10.1

Tarsier Space Technology with Galaxies Continued...

2.0.3 for Kerbal Space Program 1.8.1

Through The Eyes of a Kerbal

Download
View the world through the eyes of a Kerbal

Through The Eyes of a Kerbal

1.1.6.3 for Kerbal Space Program 1.9.1

TooManyOrbits

6.0 for Kerbal Space Program 1.9.1

Tracking Station Evolved

3.13.0.0 for Kerbal Space Program 1.9.1

Kerbal Alarm Clock

3.0.0 for Kerbal Space Program 1.10.1

Tundra Exploration - Stockalike Dragon V2 and Falcon 9

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

Tundra Exploration - Stockalike Dragon V2 and Falcon 9

2.0.1 for Kerbal Space Program 1.8.1

Tundra's Space Center

0.7.0.1 for Kerbal Space Program 1.9.0

WasdEditorCameraContinued

Download
WasdEditorCameraContinued

WasdEditorCameraContinued

1.0 for Kerbal Space Program 1.10.1

Mk-33

0.9.7-ksp-1.8.1 for Kerbal Space Program 1.8.1

WorldStabilizer

1.3 for Kerbal Space Program 1.10.1

Ж-20 "Moroz" Spaceplane

1.1.0.1 for Kerbal Space Program 1.10.0

ZeroMiniAVC

2.0.3.2 for Kerbal Space Program 1.8.1

SimpleLogistics

0.5.13 for Kerbal Space Program 1.10.1

Wernher Checker Continued

Download
Checklist

Wernher Checker Continued