I do data analysis in neutrino physics. I use and write Free Software. GNU/Linux (currently Arch Linux). Please check my programs:

Yet Another Rsync (yarsync) is a file synchronization and backup tool.

Lena is an architectural framework for data analysis.

Note on recent complaints by moderators and old users: I care about user-friendliness and transparency of decision making on this site. Unfortunately, over time this site becomes more toxic and less friendly to users. In particular, it is an extremely good guideline to give feedback instead of simply downvoting posts from new users. I think that moderators and experienced users should be open to discussions, and though the site offers no tools for that, feel free to contact me on twitter or email (see my github).