F-Droid

Of note in this article is the mention of nel0x's fork of Syncthing-Fork, which is, as much as I've gathered, and old contributor to Syncthing and more trusted member of the community than researchxxl, as well as much more transparent about the whole changing of hands of the Syncthing-Fork project.

This issue on researchxxl's fork might also be of interest, as it documents the (lack of) response to the whole sketchiness of what is happening, as well as more discussion.