Do search the forum for more recommendations, we get this a lot 
OpenBoard or Floris
KISS Launcher
Orgzly and/or Markor
Fennec or Mull
Conversations
Silence
Netguard
Simple Gallery Pro (more Simple apps)
Material Files or GhostCommander
Syncthing
Organic Maps or OSMAnd
Audio Recorder
Etar
FairEmail
FreedCam
eSpeak or RHvoice
FreeOTP+
Librera Pro
VLC
etc based on “your everyday”