Alternativas ao Taskr para Web com licença de código aberto

• Web
  Todas as plataformas Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry Blackberry 10 Apple Watch Android Wear Pebble iPad Android Tablet Kindle Fire Web Self-Hosted Software as a Service (SaaS) Firefox Safari BSD S60 Chrome Ruby Gmail React GNU Emacs Cloudron
• Licença Open Source
  Qualquer licença Licença gratuita Licença Open Source Licença comercial