问HN：有哪些优秀的开源项目网站的例子？
在这里讨论开源项目时，常常会围绕项目的网站展开对话。人们会提出批评和改进建议。在这种精神下，您能否列举一些优秀的开源项目网站？——那些能够满足新访客和回访者所有关键需求的网站。为了加分，请解释一下这个网站为何出色。
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Often when an open source project is discussed here on HN there is a conversation around the project's website. Criticisms and suggestions for improvement get raised. In that spirit, could you name examples of awesome open source project websites? -- websites that hit all the key requirements for new and returning visitors. For extra points, please explain why the website is awesome.