Things that I've personally worked on.
Search Google Play Store apps through filters as a frontend of Appfilter.net website.
Convert CSV formatted text translation strings into Android or iOS compatible formats.
Database of available software demonstrations through emulators. Under construction, currently contains some malware simulation demonstrations.
Check recent earthquakes that have occurred on Earth.
A plain simple client for Texas Hold'em poker game. Create a room, share room ID, let others join and hope things don't break while playing.
Convert Hypnospace Outlaw Page (HSP) files to HTML format.
Simple launcher for Android.
Database of malware descriptions. It's still under construction and might not be even finished.
Generate message box images.
Open implementation of Alchemy Deluxe game from PopCap.
Convert SVGs into Android or iOS compatible asset formats.
Browse the old web through a proxy that uses Wayback Machine from Internet Archive.