Alternativas ao conjure.io para Software as a Service (SaaS) com licença de código aberto

• Software as a Service (SaaS)
  Todas as plataformas Windows Mac Chrome OS Android iPhone Apple Watch iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) Wordpress Apple Messages Apple TV Sketch Adobe Photoshop
• Licença Open Source
  Qualquer licença Licença gratuita Licença Open Source Licença comercial