BookStack
Description: BookStack is an open source knowledge management platform to help build and organize wikis for internal or public use. It allows you to collaboratively write and structure documents to organize knowledge, notes or documentation.
Type: software
Pricing: Free
GroupMe
Description: GroupMe is a free group messaging app that allows people to stay connected through group chats, direct messages, and photos. It's popular for coordinating events, keeping in touch with friends and family, and communicating within work teams or student organizations.
Type: software