AntennaPod is The best podcast app I’ve come across

Delta chat is chat over email infrastructure

Linklater is a client for my selfhosted linkding bookmark app

Tusky is my mastodon app of choice

Unciv is Civ5 scaled down to pixel graphics

Termux is my terminal emulator for android

Weechat-android I use for chatting on IRC

Kahon I use for reading manga and comics

But my instinct is to first check on fdroid before I look for something on Google play