Kerbal Space Program
2,277 Mods
Utility and Navigation
Miscellaneous
Science
Parts Pack
Propulsion
Structural and Aerodynamic
Gameplay
Resources
Command and Control
Ship Systems
Sub-Assembly
Physics
Twitch Integration
Modular Rocket Systems (MRS) by Orvidius
116k DownloadsA parts pack mod containing a variety of stock-alike parts that are meant to fill in the existing gaps in the stock selection, and offer additional cosmetic options.
QuizTech Aero Pack
114k DownloadsA pack for stock-a-like and miscellaneous spaceplane parts!
SpaceX Launch Pack (LLP) by LazarusLuan
104k Downloads35-piece complete parts pack for KSP that includes the SpaceX Dragon V2, Dragon Cargo, Falcon 9 v1.1, Falcon Heavy and SHERPA launch systems.
Spaceplane Plus (Obsolete)
89.8k DownloadsThis mod is now included in the Stock game!
Real Scale Boosters
76.9k DownloadsRealistically sized and balanced rocket parts, based on real world rockets.
Knes
72.2k DownloadsKnes
SDHI Service Module System
60.7k DownloadsService Module and accessories designed specifically for use with the stock Mk1-2 Command Pod, vaguely resembling NASA’s Orion MPCV. May or may not have a convincing stockalike appearance.
FASA - Kerbal NASA - Mercury to Apollo
53.4k DownloadsFASA is a mod for kerbal that adds in early NASA rockets and pods incuding Mercury, Gemini, Apollo, and many more.
AIES
48.3k DownloadsSet of parts for all kinds of missions and rocket parts
KerBalloons
47.7k DownloadsAdds several balloons and extras to KSP
KSP Deutsch Patch
42.4k DownloadsKSP translated into german
FuelWings
41.9k Downloadshis addon allows you to add and customize fuel types/quantities in stock, B9, and ProceduralWings!
SpaceX Exploration Expansion (LEE) by LazTek
38.9k Downloads12-piece add-on planetary exploration parts pack for the SpaceX Launch Pack that includes advanced engines, a habitat, fuel tanks and fairings.
- Rocket Factory -
38.4k Downloadsthis MOD has many command pods with up to 11 crew. Moreover, new fuel tanks, many solar-panel and high performance engines.
Ven's Part Revamp
36.4k DownloadsA part pack aims to replace most of the stock parts in the game.
Deep Space Surface Habitat Unit Pack
35.4k DownloadsOuter-space deployable habitat parts pack
Kerbonov Parts Pack
33.9k DownloadsSeveral parts, including some cockpits with IVA views.
Space Shuttle Engines (SSE) by dtobi
33.5k DownloadsSpace Shuttle Engine parts pack by Klockheed Martian Engine Manufacturer - for Kerbal Space Program.
AoA Technologies
32k DownloadsAdds new cockpit and drone core for the MK2 System
Radial Engine Mounts by PanaTee Parts International (PPI)
31.6k DownloadsA set of radially attached mounting points for increased flexibility with stack-only parts. Including decoupling and fuel crossfeed functionality.