具有商业许可证的PureOS (Purism)版Keep In Touch的替代方案

• PureOS (Purism)
  所有平台 Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry Android Wear iPad Android Tablet Windows S Web Self-Hosted Software as a Service (SaaS) Windows Mobile Wordpress Chrome HP webOS PureOS (Purism)
• 商业牌照
  任何牌照 免费许可证 开源许可证 商业牌照