Alternativer til Collabtive til Self-Hosted med open source-licens

• Self-Hosted
  Alle platforme Windows Mac Linux Chrome OS Android iPhone Apple Watch iPad Android Tablet Windows S Web Self-Hosted Software as a Service (SaaS) PHP Chrome Ruby Thunderbird MySQL Community Edition Cloudron MariaDB Ruby on Rails Microsoft SQL Server PostgreSQL
• Open Source-licens
  Enhver licens Gratis licens Open Source-licens Kommerciel licens