FileProInfo - It's All About Files, Software, Online Tools - 100% Free
LinkedIn Recruiter - LinkedIn Recruiter is a recruiting tool to hire talent from LinkedIn.
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
Lever - A modern web app for hiring. Lever is a simple, powerful way to manage lists of candidates during the hiring process.
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
Greenhouse - Greenhouse Software makes companies great at hiring.