FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
Schnack - Schnack is an open source commenting system written in JavaScript.
Convertio - File Conversion in the Cloud
GitHub Team Discussions - Now there's more space to talk through your projects 💬
FILExt - Open, view and convert files online
Product Hunt Reviews Widget - Embed and encourage PH reviews into your product