Fandom
Description: Fandom is a website that hosts fan-made wikis for TV shows, games, books, and more. It allows fans to collaborate and build databases of information on topics they love.
Type: software
Mailman
Description: Mailman is an open source mailing list management system. It helps manage email discussion and announcement lists, allowing users to subscribe and unsubscribe, and helping admins moderate and post to the lists.
Type: software
Pricing: Free