Alternativas ao HEAD 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 Windows Phone iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) Firefox Opera Safari PHP jQuery Electron / Atom Shell Chrome Microsoft Edge SQLite NGINX Liveweave jsFiddle JS Bin Plunker CodePen
• Licença Open Source
  Qualquer licença Licença gratuita Licença Open Source Licença comercial