Kik
Description: Kik is a free instant messaging app for mobile devices that allows users to chat with friends using text, stickers, gifs, and more. It's especially popular among teenagers and known for its anonymity features.
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