Millennium supports creating and managing Steam client modifications through an open source, low-code framework.
Open source
24 alternativesMillennium
Customize the Steam Client with themes and plugins using the Millennium open-source framework.
About Millennium
Millennium is an open-source framework for creating and managing Steam Client themes and plugins on Windows and Linux. It provides custom CSS and theme support with a built-in editor with live-edit capability, plus plugin support for Steam. The project states it blocks Steam analytics and crash reporting out of the box, has no in-built telemetry, and is portable.
Language additions are limited to languages officially supported by Steam, and only English locales are maintained by SteamClientHomebrew. Only select derivatives are maintained by SteamClientHomebrew, with other packages such as NixOS and Arch Linux (AUR) maintained by the community.
Key features
- Create and manage Steam Client themes using custom CSS
- Built-in CSS editor with live-edit capability
- Plugin support for Steam Client
- Blocks Steam analytics and crash reporting out of box
- Portable installation on Windows and Linux
- Community packages for NixOS and Arch Linux (AUR)
Best for: Steam users on Windows or Linux who want to use custom themes and plugins.
Good for
- Open-source under MIT license
- States no in-built telemetry and blocks Steam analytics and crash reporting
- Built-in CSS editor with live-edit capability
Watch out for
- Only languages officially supported by Steam can be added
- Only English locales are maintained by SteamClientHomebrew
- Only select derivatives are maintained by SteamClientHomebrew
Millennium at a glance
- Category
- Gaming › Game Utilities & Launchers
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Linux, Windows
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Millennium FAQ
Which operating systems does Millennium support?
Windows and Linux, with external packages noted for NixOS and Arch Linux (AUR).
Which languages can be added to Millennium?
Only languages officially supported by Steam, based on the existing English locale.
How do I build Millennium from source?
The repository directs users to BUILDING.md for build instructions for each platform.
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