Title says it all. I’ll go first:
I don’t really have any on my computer (all I use that for is Vim, Firefox, and Git), but on my phone: Orbot (basically Tor as a VPN on your phone).
Edits: Added link, fixed formatting
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I forget what it’s called, but I have one I got off F-Droid that just does a spectrogram of the microphone input. It’s cool seeing the world yet another way.
Oooh, that sounds cool! If you remember the name please tell us!
I’ve taken the extraordinary step of walking a few feet to my phone, and it looks like it’s just called “Audio Spectrum Analyzer”.
One thing you pick up on quickly is that speech is mostly undertones, and the actual information carrying part is subtle variation in the higher parts of the sound. Singing is noticeably different, and manner of speech is also very visible.
