[buovjaga]

Retroshare is a Qt desktop application with a recent Android version: https://github.com/RetroShare/RetroShare/blob/master/retrosh...

LibreOffice has an Android version: https://wiki.documentfoundation.org/Development/BuildingForA...

These are the projects I am affiliated with.

[git-pull]

The above projects are open source. So those are definitely areas where you can pitch in!

[subinsebastien]

I have not considered open source projects which are in development, since it prevents me from having an opportunity to develop from scratch, also highly likely that I have to use toolchain which the project is already using, as opposed to tools that I'm familiar with.