This is the Bitbucket Mylyn Connector update site.
This page is not meant to be accessed with a web browser. The best way is to use the Eclipse update feature as described here: https://bitbucket.org/pplupo/bitbucket-mylyn-connector/wiki/Home.
The update site URL to be used within Eclipse is http://babelserver.org/mylyn-bitbucket/
Here is the issue tracker: https://bitbucket.org/pplupo/bitbucket-mylyn-connector/issues?status=new&status=open