ClassOwl - ClassOwl is an interactive planning app teachers use to communicate directly with students to stay on track anytime, anywhere.
FileProInfo - It's All About Files, Software, Online Tools - 100% Free
Mirro - An all-in-one team performance management solution made easy
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
Google Classroom - Learning management tool by Google
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.