I'm the developer behind Fluxer – self-hosting is ready to use already [1][2][3], people are using it actively currently, and I'm currently working to make account switching across instances in the desktop app a reality. This, with a big voice update around the corner, will let us move much faster moving forward!

[1]: https://fluxer.app/blog/mobile-clients-and-fluxer-v2

[2]: https://docs.fluxer.app/operator/get-started/

[3]: https://github.com/fluxerapp/fluxer