Alambic is an open-source platform for the management and visualisation of software engineering data.
It basically retrieves metrics from many various repositories (code metrics, scm, its, mailing lists, stack overflow questions, etc.) and makes them available for custom plugins to produce analysis, numbers, graphics, and data sets.
Alambic was first designed for the needs of the PolarSys Maturity Assessment project. It has considerably evolved since then, becoming more generic and data-oriented. It is now used for software development project management and InnerSourcing.
Check Alambic's home: https://alambic.io