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
8 points
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Check out StreetComplete. It shows you missing osm data close to you so you can add that information directly. Very good way to get highly detailed information into OSM, like accessibility for stairs (handrail, ramps, etc.) or opening hours for shops (including updating older data)
3 points
