FileProInfo - It's All About Files, Software, Online Tools - 100% Free
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
Supabase - An open source Firebase alternative
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
Etebase - Etebase makes it easy to build end-to-end encrypted applications by taking care of the encryption and its related challenges.