"SonarQube is an open platform to manage code quality."[1] I've started writing a plugin for Sonar that allows it to display code quality metrics for D. So far it just supports tracking static analysis warnings from D Scanner, though adding other metrics like line of code count and unit test coverage should be fairly simple. It's available here[2].

[1] http://www.sonarqube.org/
[2] https://github.com/economicmodeling/sonar-d-plugin