# SteamClientHomebrew/Millennium

Open-source modding framework for creating and managing Steam Client themes and plugins.

Repository: https://github.com/SteamClientHomebrew/Millennium
Canonical: https://ross.abutalabs.com/products/millennium
Homepage: https://steambrew.app
Language: C++
License: MIT
License Family: permissive
Topics: reverse-engineering, steam, valve, millennium, patcher, skins, themes, plugins-api
Last push: 2026-08-18T22:17:09+00:00

## Health v2 (maintenance only)
Score: 96/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 98, longevity 87
- inputs: {"age_days": 1221, "days_push": 15, "days_rel": 15, "gap_med": 0.5, "n_releases_24m": 57}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4229, forks 155 (observed 2026-08-28T04:08:39.364599+00:00)

## What it is
Millennium is an open-source modding framework for the desktop Steam Client that lets users create, manage, and install custom CSS themes and JavaScript plugins. It patches the Steam client at runtime, ships a plugin loader and developer API, and blocks Steam analytics and crash reporting by default.

## Use cases
- customize the Steam client with custom CSS themes
- install community plugins to extend Steam functionality
- develop my own Steam client plugin with JavaScript
- block Steam analytics and crash reporting
- make Steam look like a different app or wallpaper
- live-edit Steam client CSS with an inbuilt editor

## When to choose
- you want to theme or extend the desktop Steam Client on Windows or Linux
- you want a plugin API and theme manager maintained actively by a community
- you want a privacy-friendly Steam client without telemetry

## When to avoid
- you use Steam installed via Flatpak or Snap, or on ARM-based Linux distributions
- you only play games and never want to modify the Steam client
- you need console (Steam Deck handheld UI) or mobile Steam customization

## Facets
- artifact type: framework
- maturity: active
- function: plugin-system, theme, middleware, security, developer-tools
- domain: gaming-tools, developer-tools, desktop-applications
- platform: windows, cpp
- tags: steam-client, steam-modding, themes, plugins, css-theming, homebrew, client-patching, automation, linux, desktop

## Member repositories
- SteamClientHomebrew/Millennium (main) score 96

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:39.364599+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:22:21.087709+00:00, confidence not recorded.
  - readme: https://github.com/SteamClientHomebrew/Millennium (fetched 2026-08-28T04:08:39.364599+00:00, sha c362f0c69e5b)
  - homepage: https://steambrew.app (fetched 2026-08-29T09:12:21.713824+00:00, sha 7e052192e31f)
  - site_page: https://docs.steambrew.app/users (fetched 2026-08-29T09:12:21.723097+00:00, sha ee413477d9a6)
  - site_page: https://docs.steambrew.app/users/getting-started/installation (fetched 2026-08-29T09:12:21.724832+00:00, sha 333315c76a4b)
  - site_page: https://docs.steambrew.app/ (fetched 2026-08-29T09:12:21.726651+00:00, sha c67cd78ff33e)
- Data as of 2026-08-30T08:39:29.467469+00:00.