具有开源许可证的PostCenter版Groove的替代方案

• PostCenter
  所有平台 Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) PHP Windows Mobile Slack Chrome MySQL Community Edition Google Apps Trello PostCenter
• 开源许可证
  任何牌照 免费许可证 开源许可证 商业牌照