PowerSchool - PowerSchool provides a K-12 education technology platform for operations, classroom, student growth, and family engagement.

FileProInfo - It's All About Files, Software, Online Tools - 100% Free

Teachable - Create and sell beautiful online courses with the platform used by the best online entrepreneurs to sell $100m+ to over 4 million students worldwide.

File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.

Clever - syncing between education applications for K-12 schools

FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.