Essentials: App verifier, zapstore, orbot, favorite Lightning and Bitcoin Softwares (Zeus, and nunchuk, personally), Pipepipe(youtube) signal/molly(messenger), Protonmail(email), and keet(video calls) just to name a few.
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It's beta so it does have issues but they are very responsive to fixing any problem just look at their change log 
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keet-mobile-releases/CHANGELOG.md at main · holepunchto/keet-mobile-releases
Keet mobile releases. Contribute to holepunchto/keet-mobile-releases development by creating an account on GitHub.