Millennium is an Infrastructure & Backend product. Enabling users and developers to customize and extend the Steam Client with themes and plugins. It is built as an open-source project for steam users and mod developers. Millennium is open source under the MIT license. The product ships for the web, Windows, Linux, macOS, and the command line, and it can be self-hosted.
It is developed by shdwmtr, and the product first shipped in 2020. Development happens publicly on GitHub with 642 stars and 2 commits in the last 90 days. Key capabilities include theme management, plugin support, and steam integration.
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