Kerbal Space Program
2,268 Mods
Easy Vessel Switch (EVS)
227k DownloadsMakes switching vessels easy and predictable
Feline Utility Rovers
217k DownloadsThis mod adds part for rovers. It includes also a laboratory and means to create articulated rovers
Community Tech Tree
210k DownloadsExpanded tech tree for KSP
Firespitter
199k DownloadsPropeller plane and helicopter parts
BDArmory Weapons Extension
197k DownloadsNext Star Industries Nuclear and Heavy Weapons
MechJeb Embedded Universal
195k DownloadsMechJeb Embedded with ModuleManager it Gives MechJeb Functionality to every command module, even from mods! Version Independent (should be :P) Career mode supported
Kerbal Atomics
189k DownloadsAdditional nuclear engines for KSP
Cryogenic Engine Pack
184k DownloadsHigh Isp chemical rockets!
HotRockets! Particle FX Replacement
179k DownloadsHotRockets! Release for 1.0.4
Stockalike Station Parts Expansion
163k DownloadsSpace station and surface base parts [just updated with more parts]
For Science!
160k DownloadsYour science autopilot.
Far Future Technologies
149k DownloadsOptimistic but generally viable future spacecraft technologies.
Realistic Atmospheres
148k DownloadsRemodeled atmospheres for all KSP celestial bodies.
USI Kolonization Systems (MKS/OKS)
147k DownloadsOrbital and planetary bases and colonies for KSP!
(6S) Service Compartment Tubes (SCT)
138k DownloadsEver wanted to have smooth rockets without putting RCS tanks, batteries, mechjeb and whatnot on the top of the hull? Here’s a solution! And it is only 2 PARTS!!!
Unofficial B9 Aerospace REPACK
134k DownloadsMy "Unofficial" repack of B9 Aerospace that Just Works (TM)
Tarsier Space Technology Continued...
132k DownloadsSpace Telescopes with Galaxies and Rover Chemical analysis
Transfer Window Planner
132k DownloadsAn in-game implementation of AluxMun's Launch Window Planner WebApp - to plan when to make planetary transfers
Lazor System
131k DownloadsLazor System is an advanced targeting and guidance system with a lot of functions bundled in subsystems which can be activated by placing colored lazors on your vessel.
The Maritime Pack
118k DownloadsYachts, Cargo Ships, Carriers, Paddlewheelers, RoRo's, Submarines, Tug Boats and lots more.