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ffmpeg, imagemagick, povray, supercollider, blender ...
I'd also say amule, qbittorrent, fopnu (freeware, but not free), retroshare.
There are likely many others. EDIT: ... I can't quickly remember.
Awesome list.
Would add TestDisk/ photorec
Ah, yes, saved me the heaviest (and longest to make) povray scene I've ever made after accidentally deleting it.
How do you use retroshare? I recently discovered it because it could share on I2P but haven't figured how to use it (not that I spent too much time trying either...)
You have to find peers, I've lost most of them anyway since I haven't launched it for a month or so.
That's a manual process, though finding people on chats and forums once you have at least one online peer is easier.