Tools

• Amaze File Manager
  • Lets you browse/manage files on the phone
  • Open-source: https://github.com/TeamAmaze/AmazeFileManager
• Apex Launcher
  • Customizable replacement home screen launcher
• Llama
  • Lets you automate just about anything on your phone. Amazing app!
  • No longer available on Google Play; download from https://www.mediafire.com/file/5q7wpcfcacty8a0/Llama.1.2014.11.20.2330.apk/file
• Unit Converter Ultimate
  • Unit converter with clean interface
  • Open-source: https://github.com/physphil/UnitConverterUltimate

Productivity

• Google Docs
  • View, edit, and create documents, including Microsoft Word documents
• Google Keep
  • Great for taking notes. Syncs online with https://keep.google.com/
• Tasks.org (formerly Astrid)
  • The best to-do list app I’ve used
  • Open-source: https://github.com/tasks/tasks

Multimedia

• Adobe Reader
  • Read PDF files
• AntennaPod
  • Excellent and free podcasting app with a clean interface
  • Open-source: https://github.com/AntennaPod/AntennaPod
• Last.fm
  • Scrobbles music to last.fm
• SoundHound
  • Lets you identify music by recording a song clip, singing, or humming
• Spotify
  • Listen to practically any music for free

Language learning

• AnkiDroid
  • The best flashcard app for Android
  • Open-source: https://github.com/ankidroid/Anki-Android
• Duolingo
  • Ad-supported app for learning languages

Navigation

• CoPilot GPS
  • The best paid, fully functional GPS app. Works offline.
• HERE Maps
  • Free GPS app with offline maps and navigation in over 100 countries
• My Tracks
  • Record GPS tracks of trips you take
• Waze
  • GPS navigation with user-submitted info like traffic, police traps
  • Doesn’t fully work offline, but can cache GPS maps for offline GPS

Games

• RetroArch
  • Emulator frontend that lets you play old console video games, like Atari, Game Boy, NES, Nintendo 64, Playstation, Sega Genesis, and SNES
  • Open-source: https://github.com/libretro/RetroArch
• ScummVM
  • Lets you play old-school adventure games (See: Playing old-school adventure games on Android)

Misc

• Fuelio
  • The best app for tracking fuel economy
• Google Opinion Rewards
  • Fill out surveys for credit on the Google Play store
• Merriam-Webster Dictionary
  • Free English dictionary. Works offline.
• Pocket
  • Save articles for reading later
• Stocard
  • Lets you store all your reward cards in one place on your phone