Kallithea is a cross-platform free software source code management system, the primary goal of which is to provide a repository hosting service with features for collaboration, such as forking, pull requests, code review, issue tracking etc. Kallithea is a fork of RhodeCode, created after the original developer has changed the license terms. While earlier versions of RhodeCode were licensed entirely under the GNU General Public License version 3, RhodeCode version 2.0 (released in August 2013) introduced exceptions for parts of the software distribution. According to Bradley M. Kuhn of Software Freedom Conservancy, this exception statement is ambiguous and "leaves the redistributor feeling unclear about their rights".