Alternativer til Letterspace til Software as a Service (SaaS) med open source-licens

• Software as a Service (SaaS)
  Alle platforme Windows Mac Linux Chrome OS Android iPhone iPad Android Tablet Kindle Fire Web Self-Hosted Software as a Service (SaaS) Firefox Opera PortableApps.com Chrome Visual Studio Code Termux
• Open Source-licens
  Enhver licens Gratis licens Open Source-licens Kommerciel licens