Helix software evolution data set

The Helix Data Set is a compilation of release histories of a number of non-trivial Java Open Source Software Systems. It has been developed to assist researchers in the field of empirical software engineering with a focus on software evolution. Each of the systems available as part of the Helix Data Set includes: (1) The releases: the JARs containing the class files for each release of the systems along with meta data; (2) The metrics: a metric history derived from extraction of the releases. You can use this data directly for your research projects. The complete dataset is currently 84 .zip files (each containing .jar files, .version files and html files) and 42 .txt files. The collection of release histories currently measures approximately 2.23 GB in total but is available for download in separate components from the project's website.