LibreOffice
LibreOffice consists of programs for word processing, creating and editing of spreadsheets, slideshows, diagrams and drawings, working with databases, and composing…
Free Productivity
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Etherpad
Highly customizable open-source online editor providing collaborative editing in real time.
Vikunja
The project is still under development and the native apps are not final yet, but the web version works great. Offers an import feature from Todoist, Trello and Microsoft To-Do.
EtherCalc
Your data is saved on the web, and people can edit the same document at the same time. Everybody's changes are instantly reflected on all screens.