Moxi

Moxi: a mod manager built from scratch

Game modding has a UX problem. Most existing tools are bloated, locked to one game, or make you create an account just to install a plugin. The goal was something simpler: download, open, install mods, play.

Moxi is a lightweight open-source mod manager for PC games. No accounts, no ads, no telemetry. Just mods.

WHAT IT DOES

Automatic Steam detection. Scans all Steam library folders across every drive and finds supported games without any manual setup.

Mod loader management. If a game needs BepInEx, SRML, or MelonLoader, Moxi installs that first before touching anything else.

Dependency resolution. If Mod A requires Mod B, Moxi detects it and asks you to confirm the full install chain before proceeding.

Toggle mods without uninstalling. Disabled mods are renamed in place and ignored by the game until re-enabled.

Auto update checks. Moxi checks for a new version on every launch.

Supported games: Planet Crafter, Subnautica, Subnautica: Below Zero, Slime Rancher, Slime Rancher 2. Dyson Sphere Program.

THE TECH STACK

Python 3, CustomTkinter for the UI, Pillow for images, Requests for network calls.

The mod index is a plain JSON file in the repo (Mods/ModIndex.json). Moxi fetches it, resolves dependencies, downloads files to the right destinations, and logs everything to %LOCALAPPDATA%\Moxi\installed.json. No database, no backend.

Adding a new mod does not require an app update. Mod authors open a PR, the index updates, and it shows up for everyone immediately.

WHAT IS NEXT

Adding a new game is just a new entry in Games/GameIndex.json. On the roadmap: broader game support, better mod search and filtering, and Linux support.

LINKS

GitHub: https://github.com/KerbalMissile/Moxi Website: https://kerbalmissile.github.io/MoxiWebsite/ Discord: https://discord.com/invite/Y53vwvQRDc

Open to contributions and PRs. Mod maintainers for supported games are welcome to get their work listed.