Berezin wrote that ERC was "originally written by Alexander L. Belikoff, then I improved it in many ways and promoted to version 2.0". The pair stopped development in 1999. Mario Lang wrote that as of 2001 ERC had been "apparently abandoned", so he and Alexander Schroeder adopted it and created the ERC SourceForge project. Berezin responded positively to news of the renewed effort and bestowed stewardship to the new developers; in the ensuing years, versions 2.1, 3, 4, 5, and 5.1 were released. ERC development moved from SourceForge to GNU in May 2006,