Alternativas ao WebSequenceDiagrams para Software as a Service (SaaS) com licença de código aberto

• Software as a Service (SaaS)
  Todas as plataformas Windows Mac Linux Chrome OS Android iPhone iPad Android Tablet Web Software as a Service (SaaS) Microsoft Office Word Google Drive Google Drive - Docs Google Apps Microsoft Office Suite Google Drive - Sheets
• Licença Open Source
  Qualquer licença Licença gratuita Licença Open Source Licença comercial