Zeplin - Collaboration app for UI designers & frontend developers
TinyCat - The online catalog and integrated library system for tiny libraries, powered by LibraryThing.
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
Koha - Koha is the first free and open source software library automation package (ILS).
ActiveWords - Auto correct on steroids
DSpace - DSpace open source software enables open sharing of content that spans organizations, continents...