具有开源许可证的Software as a Service (SaaS)版wireframe.cc的替代方案

• Software as a Service (SaaS)
  所有平台 Windows Mac Linux Android iPhone iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) Firefox PortableApps.com Slack Electron / Atom Shell Trello Microsoft Office Suite Atlassian Stash Google App Engine
• 开源许可证
  任何牌照 免费许可证 开源许可证 商业牌照