FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
GoReplay - GoReplay is an open-source tool for capturing and replaying live HTTP traffic into a test environment.
Convertio - File Conversion in the Cloud
Testlio - Testlio is a community of expert testers that help companies release their apps with highest confidence
FILExt - Open, view and convert files online
Assertible - Assertible software provides you with a simple and quick way to monitor your web services. It comes with automated QA tools that users can utilize to test and monitor their web services on different platforms and environments.