1. IS IT MAINTAINED** 检查一个开源项目的活跃度
https://isitmaintained.com/
Check the activity of open source projects
2. travis-ci.com github持续集成工具
Easily sync your GitHub projects with Travis CI and you'll be testing your code in minutes.
3. processon.com 免费在线作图
持流程图、思维导图、原型图、UML、网络拓扑图、组织结构图等
Created by suyaqiang (sueeing@126.com) on 2019/1/20.
4. http://c4model.com/* 软件架构的C4模型
The C4 model for visualising software architecture
Context, Containers, Components and Code
**粗体** _斜体_ [链接](http://example.com) `代码` - 列表 > 引用。你还可以使用@来通知其他用户。