This utility is designed to allow you to apply skins to the modern Steam client
Open source
24 alternativesMillennium
Open-source modding framework for creating and managing Steam Client themes and plugins.
About Millennium
Millennium is an open-source framework for creating and managing themes and plugins for the Steam Client. The project is distributed as a GitHub repository under the MIT license and runs on Windows and Linux. The README describes installation as a few steps and points to a separate guide, and it refers to BUILDING.md for users who want to build from source.
The framework includes a built-in CSS editor with live-edit capability for custom styling, and it supports plugins that the project describes as allowing full control over Steam. The project says it blocks Steam analytics and crash reporting by default and includes no built-in telemetry. Some packages are maintained by community repositories, such as NixOS and the Arch Linux AUR, rather than by the project itself. Translations are community managed, and only languages officially supported by Steam can be added.
Key features
- Built-in CSS editor with live-edit capability
- Support for custom CSS and themes for the Steam Client
- Plugin support described as allowing full control over Steam
- Blocks Steam analytics and crash reporting by default, per the project
- No built-in telemetry, according to the project's README
- Available for Windows and Linux
Best for: Steam users and developers who want to customize the Steam Client with themes or plugins on Windows or Linux.
Good for
- Open source under the MIT license
- Live-edit CSS editor for previewing theme changes
- Project states that it blocks Steam analytics and crash reporting by default
Watch out for
- New locales are limited to languages officially supported by Steam
- Translations are community managed, and contributors are responsible for updating non-English locales when English changes break them
Millennium at a glance
- Category
- Gaming › Steam Communities & Tools
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Linux, Windows
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Millennium FAQ
Which operating systems does Millennium support?
The repository lists Windows and Linux as supported platforms.
Can I add a new language?
Only languages officially supported by Steam can be added. The README describes the steps to base a new locale on the English locale and register it in the localization files.
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