Great work, thank you !

When will the apps be available at Google Play ?

I'll advice against enabling "Developer mode" or Installation of Apps from "Unknown Sources".
Its bad practice from security standpoint.

Don't use the provided links / QR codes.
Get the apps from GitHub and compile them on your own.

Thanks again, I'll clone the repo and try them out.

UPDATE: I don't see the source code, only the apks in the repo, I guess I'll wait for you to put the source on GitHub or at least be approved by Google.