I use and write Free Software. GNU/Linux (currently Arch Linux). I do data analysis in neutrino physics. Please check my main programs:
Yet Another Rsync (yarsync) is a file synchronization and backup tool.
Lena is an architectural framework for data analysis.
UPD 2022: unfortunately, I can see StackOverflow becoming a very user-unfriendly site. We don't even have ways to complaint about moderator actions! I considered deleting all my posts here, but I think that we should think about people who could use them, so let them be. But it would be good to look for better platforms. Actually, there were scandals with moderators here before. I think that no feedback eventually will make the site very bad, it is a very subtle and dangerous route.