Alternativer til wireframe.cc til Software as a Service (SaaS) med open source-licens

• Software as a Service (SaaS)
  Alle platforme Windows Mac Linux Android iPhone iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) Firefox PortableApps.com Slack Electron / Atom Shell Trello Microsoft Office Suite Atlassian Stash Google App Engine
• Open Source-licens
  Enhver licens Gratis licens Open Source-licens Kommerciel licens