Orbot (from Guardian Project repo’)
Torbrowser (from Guardian Project repo’)
Editor by Bill Farmer
Davx5 and (Etar) Calendar (and Contacts)
MuPDF viewer
OpenCamera
ImagePipe or Scrambled Exif
OsmAnd~, and a couple GigaBytes of offline data files
TSCH_BYL, and Survival Manual 
===
Simple Draw
Planisphere
QR Scanner
WiFiAnalyzer
Phyphox
SatStat
Loyalty Card Keychain or Voucher Vault
…