I don’t use the Play store (don’t want a Google account) and prefer to stay away Github because Microsoft. Thanks.
Added: Thanks for the links! Unfortunately it looks like the app requires Android 8.0+ and my phone is still on Android 7. Is that inherent to Jetpack or some other part of the app technology? It would be good to not have to keep churning to the latest shiny.
Lemmynade is a fork of Lemmur. The dev plans to upload it to F-Droid too, but currently itls only on GitHub.
There is already an apk file there. I used it a little bit, works pretty well on my device.