24
What are your favourite open-source apps this year?
(lemmings.world)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
IzzyOnDroid is an F-Droid style repository for Android apps, provided by IzzyOnDroid. Applications in this repository are official binaries built by the original application developers, taken from their resp. repositories (mostly Github).
Probably Thunderbird, I only discovered it this year. I have like 5 email addresses, and it's so much more convenient to have all of them in one place, instead of needing to check each one one by one