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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Culture Codes - Company culture decks aggregated all in one place
Convertio - File Conversion in the Cloud
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
Culture Your Culture - Finally, the much needed step-by-step "how to" for culture
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.