Markor - A markdown/text editor app. It is frankly not the best in terms of design, but it does have quite a few neat features.

Just wish that firefox Android supports “right clicking” extensions, though.

Right now, extensions that use the right-click context menu to function (e.g. Singlefile) doesn’t work that well on Android.

I’ve also found another client for Android: syncthing tray, which seems to come from a popular client for desktop but it also supports Android.

https://github.com/Martchus/syncthingtray

Personally, I find it a good replacement, though its gui is slightly slower and it does not support all the features that syncthing-fork has.