FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
devZing - Bugzilla, MantisBT and Subversion Hosting Software Development - Simplified
Convertio - File Conversion in the Cloud
GoReplay - GoReplay is an open-source tool for capturing and replaying live HTTP traffic into a test environment.
FILExt - Open, view and convert files online
Testlio - Testlio is a community of expert testers that help companies release their apps with highest confidence