Oneye - Oneye is a takeover of the legacy series one from the eyeos project.
FileProInfo - It's All About Files, Software, Online Tools - 100% Free
CloudMe - Key Features: - Access to all your files and folders in CloudMe. - From 3GB (free) to 500 GB (paid) of file storage, accessible directly in your device. - View photos, videos, and documents wherever you are.
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
eyeOS - eyeOS is a web desktop following the cloud computing concept that seeks to enable collaboration and communication among users.
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.