(Mentioning F-droid apps is cheating)
>>59822251
EBookDroid is pretty nice
Pulsar
/g/ never recommends it, its completely free and without ads
solid music player for android
Glovebox - you can put shortcuts in a sidebar accessible from anywhere. Once you get used to it you never have to go to the homescreen anymore.
Auralux 2 is a great strategy/simulation game and /u/nited is something like a text-based image board but with a great community.
Firefox Aurora
>>59822251
Nightly Firefox