Ballot Browser

Ballot Browser is open [source software|open source] ballot counting software developed initially for the Humboldt County Election Transparency Project. In November 2008, counting performed with Ballot Browser revealed a bug in Premier Election Solutions' GEMS tabulation software. Subsequent investigation by the California Secretary of State led to the decertification of the GEMS version used in Humboldt County.
Ballot Browser was developed by Mitch Trachtenberg and was available, free, from http://www.tevsystems.com.

Licensing

While the Ballot Browser project page declares the license as "GNU General Public License version 2.0 ", the source code itself reports the license as "version 3 of the GNU General Public License." throughout, and includes the full text of version 3 of the GPL within the source file: HelpMessages.py.