具有免费许可证的JavaScript版Inboxer的替代品

• JavaScript
  所有平台 Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry Blackberry 10 Apple Watch Android Wear iPad Android Tablet Kindle Fire Windows S Web Self-Hosted Software as a Service (SaaS) JavaScript Python Windows Mobile Java Mobile S60 Android TV Chrome MetaMask ZeroNet OpenPGP
• 免费许可证
  任何牌照 免费许可证 开源许可证 商业牌照