具有开源许可证的Kindle Fire版Billbooks的替代方案

• Kindle Fire
  所有平台 Windows Mac Linux Chrome OS Android iPhone Windows Phone Apple Watch iPad Android Tablet Kindle Fire Web Self-Hosted Software as a Service (SaaS) Safari Internet Explorer PHP BSD Slack Apple Messages Chrome Google Drive Google Apps Asana Spiceworks
• 开源许可证
  任何牌照 免费许可证 开源许可证 商业牌照