Been awhile since I saw a thread like this and they’re always good for at least one or two things I’ve never heard of before. Bonus points if the software is open source and cross platform. Extra bonus points if you link to where we can see it/get it.
My contribution: Destiny which is an anonymous, P2P, E2EE file sharing app - its basically a GUI for a Magic Wormhole implementation. Works on Linux (tarball or appimage), Win, Mac, Android (inc f-droid) and iOS. Only downside is it’s not been updated for 2 years.
OmniDiskSweeper. Forget apps that help manage disk space with some ugly graph that’s difficult to understand. This just lists files and directories with the heaviest / most space used from top to bottom in a file tree. Essential. Here’s what it looks like: