Alternativas ao 42tasks para Firefox com licença de código aberto

• Firefox
  Todas as plataformas Windows Mac Linux Chrome OS Android iPhone Blackberry Apple Watch Android Wear iPad Android Tablet Kindle Fire PlayBook Web Self-Hosted Software as a Service (SaaS) Firefox Chrome HP webOS Install Chrome Extensions Google Chrome to Phone
• Licença Open Source
  Qualquer licença Licença gratuita Licença Open Source Licença comercial