Outline : Team wiki, documentation, meeting notes, playbooks, onboarding, work logs, brainstorming, & more…
cal.com : Open source meeting scheduling tool. Send a link, let others book a slot. Calendly alternative.
ProjectPier.org : ProjectPier is a Free, Open-Source, PHP application for managing tasks, projects and teams through an intuitive web interface. It must be downloaded a...
Mattermost : Mattermost is a self-hosted solution for bringing all your team communication to one place, and making it searchable and accessible anywhere
Documize is an open source modern, lightweight and comprehensive alternative to Confluence.
It's built with Golang + EmberJS and compiled down to a single executable binary for Linux, Windows and macOS.