Simple Poll - The easiest way to create polls in Slack
FileProInfo - It's All About Files, Software, Online Tools - 100% Free
iPoll.app - Create instant polls and forms with in slack!
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
doopoll - Create live, instant, editable polls effortlessly
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.