FileProInfo.com is the file information database of over 15,000+ file types, software, free online apps/tools, so tools, guest blogs, videos, and images.
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Goodreads - See what your friends are reading.
Convertio - File Conversion in the Cloud
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
Bookicious - Find the best new book to read with books collections for makers, founders and entrepreneurs.
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.