I have Android:

• Sleep duration data collection (Sleepbot)
• Sleepiness forecast (Sleep watcher)
• Google Drive (writing/spreadsheet)
• White noise/nature sounds for going to sleep (Lightning bug)
• Bed lamp (full screen light)
• Notes (Catch)
• Google Tasks integration (gtasks)
• Calendar
• Countdown and count up timer
• Sudoku
• Streaming audio (SomaFM)
• Fitness improvement (100 Squats)
• Camera/Photo manipulation (Painteresque/Vignette/Paper Camera)
• Knitting pattern counter/row counter
• Habit building reminder (Beeminder/Habit streak/FailLog/TaskLife)
• Daily diary
• Rain forecast for where I am (SkyMotion)
• Shared grocery list
• Current images of earth cloud cover and of the sun (Solaris)
• Current wave height, temperature and other data covering the whole earth (Earth Now)
• Dual-n-back
• IRC client (Android IRC)
• walk tracking (MyTracks)
• Psychological first aid (The Tools)
• Work timer (Pomodroido)
• When should I call my family again (Nextcall)