On f-droid, there are 3 screen filter apps that all do more or less the same thing:

• Night Light @corphish
• Night Screen by @fython
• Red Moon (duh) by myself and @raatmarien

And some apps that have partial overlap:

• OpenShift by @joonatoona
• Dimmer (no longer maintained?) by @giraffine
• Suntimes by @forrestguice

It seems like a waste of effort to have so many of us working independently on the same kinds of issues. Are any of you interested in merging our apps, or collaborating in some other way (eg, refactoring some functionality into libraries we could share)?

edit: We're all GPLv3 (or GPLv3+), so we can freely combine our code.