Productivity
Get things done: 200+ apps, all free and open source.
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In testing
Plees Tracker
A simple way to record how long and how well you sleep
Beancount.io
Track your money with simple, honest plain-text bookkeeping
AndroidAPS
A closed-loop insulin system for type 1 diabetes
SeeNot
Cut down screen time by watching what you actually do
Money Manager Ex
Personal accounts and bills that stay on your phone
CarVita
Log your car's services and get reminded when the next one is due
HearoPilot
Takes notes in your meetings, all on the phone
BeauTyXT
A private, minimal editor for plain text