• [Puppy Linux]
  • Everything needed for daily use pre-installed
  • Decent GUI
  • <~300MB
  • Different flavours
• [Tiny/Micro Core Linux]
  • Core software only, more lightweight stuff can be installed later
  • Yup, that's FLWM
  • ~16MB -- runs in RAM
• [SliTaz GNU/Linux]
• [Alpine Linux]
• [BunsenLabs Linux]
  • Based on Debian
• [Lakka OS]
  • Primarily for game console emulators
  • Targeted for single board computers
• [Tails Linux]
  • Privacy-centric
• [Porteus Linux]
  • Runs in RAM
  • KDE4

I may finish this later.