F-droid is the Android store for open source apps and is recommended by the FSFE with over 2000 apps to choose from. In this article I will be sharing 4 of apps I always make sure to have. All of these apps are of course free and without ads.
1. NewPipe
NewPipe is the YouTube client with everything you've always needed, you can play videos in the background, pop them out to play them in front of other apps and have subscriptions without logging in to a YouTube account.
2. Yalp Store
For that one Play Store app you still keep lying around, Yalp Store is a godsend and does all the work of keeping it up to date for you, as well as letting you download Play Store apps and all this without requiring a Google account.
3. Cythara
If you play a stringed instrument you know exactly how annoying tuning can be, Cythara is a tuning app that needs nothing more than your microphone and features 8 different tunings, including a chromatic tuner. It's a must-have for any musician.
4. USB Mountr
Have you ever been in a situation where you needed an operating system to boot but had no flash drive? This is exactly what USB Mountr is for, simply plug your phone into your computer set the disk image you want and hit 'mount'.