Task management/To-do lists
Money, Budgeting and Management
Collaborative software or groupware suites
Web-based project management and bug tracking systems
Self hosted project management, invoicing, and collaboration. Duet provides ever ...
Check out Duet
An open, extensible, wiki for your team built using React and Node.js.
Check out Outline
Custom communication systems
Zulip is a powerful, open source group chat application.
Check out Zulip