Culture Amp - Culture Amp makes it easy to collect, understand and act on employee feedback. Improve the engagement, experience and effectiveness of every employee - all from one platform.
Documize - Enterprise-grade wiki and knowledge management platform
Nextcloud Tasks - A tasks app for Nextcloud.
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.
Planka - Planka is an open source project management software similar to Trello.
HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.