Kerbal Space Program Modding on OpenMods

A rocketry sim with the modding scene of an open-source project

Kerbal Space Program (2015) is Squad's rocketry simulator, and its modding community has the unusual character of being more like an open-source project than a typical game-mod community. The headline mods (Realism Overhaul, Real Solar System, Realism Overhaul Realistic Progression One) are years-long collaborative engineering projects that effectively rewrite half the game.

The community-built CKAN (Comprehensive Kerbal Archive Network) is the standard mod manager, package-manager-like dependency resolution, version pinning, mod-set sharing. If you've used apt or npm, CKAN's mental model is familiar.

The toolchain

• CKAN: the community mod manager. Open-source. Handles dependencies, version compatibility, and shared mod profiles.
• Module Manager: a foundational config-patching framework most mods depend on.
• KSP version pinning: KSP's modding is heavily version-locked. Players often hold the game on a specific KSP version for mod compatibility.

What you'll find on OpenMods

KSP mods are split between SpaceDock (community-run alternative), CurseForge, and GitHub. CKAN aggregates all three. OpenMods catalogues GitHub-published KSP mods, which is a meaningful fraction of the catalogue.

Practical notes

• CKAN over manual install. Manual KSP modding works but the dependency graphs are deep enough that CKAN saves significant time.
• KSP version compatibility is strict. Each KSP version's mods are largely incompatible with adjacent versions. Pin your KSP version to whatever your chosen mod set supports.
• Realism mods are the headliners. Realism Overhaul, Real Solar System, and Realistic Progression One transform KSP into something closer to a real spaceflight simulator. Heavyweight.
• Save game compatibility is mod-specific. Most parts mods are save-safe; engine-rebalance mods often aren't.