To add to ghommey's response: we're also using Piwik right now and it fits the bill for our purposes. Separating IP ranges isn't really a concern for us as we use separate development and deployment servers.
As for customizing it, I've written a couple of Piwik plugins, one of which served to enable SSO for our (non-PHP) project. Writing the code itself has been relatively straightforward; however their authentication cookies violate the HTTP cookie RFCs (RFC2109 and RFC2068) in that they use illegal characters so there might be also other dragons in places.
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补充一下 ghommey 的回应：我们现在也在使用 Piwik，它符合我们的目的。由于我们使用单独的开发和部署服务器，因此分离 IP 范围并不是我们真正关心的问题。
至于自定义它，我编写了几个 Piwik 插件，其中一个用于为我们的（非 PHP）项目启用 SSO。编写代码本身相对简单；然而，它们的身份验证 cookie 违反了 HTTP cookie RFC（RFC2109 和 RFC2068），因为它们使用非法字符，因此某些地方可能还存在其他龙。
To add to ghommey's response: we're also using Piwik right now and it fits the bill for our purposes. Separating IP ranges isn't really a concern for us as we use separate development and deployment servers.
As for customizing it, I've written a couple of Piwik plugins, one of which served to enable SSO for our (non-PHP) project. Writing the code itself has been relatively straightforward; however their authentication cookies violate the HTTP cookie RFCs (RFC2109 and RFC2068) in that they use illegal characters so there might be also other dragons in places.
从最新版本（2010 年第 1 季度）开始，可以过滤 IP。
AS of the latest release (q1 2010) filtering IPs is possible.