Gemini is a proprietary web-based issue tracking system and bug tracking system provided by Countersoft, Ltd.
Gemini is based on Microsoft's .NET Framework. It is developed using C#, ASP.Net, and Microsoft SQL Server. Gemini supports integration with Visual Studio, Outlook, Subversion (SVN) and Windows Live Messenger.
Gemini is used by over 5000 customers. Significant open source projects that use Gemini for their issue tracking include DotNetNuke and SharpDevelop. Organizations that use Gemini to manage software products and other products include the National Health Service in the United Kingdom, Motorola, Dell, Ministère des Transports du Québec and Domino's Pizza.
Founded in 2003, Countersoft initially created Gemini as a free product. Version 1.4 was the first stable release and version 1.5 was the first commercial version (at 50 GBP).
Gemini is proprietary software, but a freeware 10-user license is available, and optional source code licensing is available with the enterprise license.
Gemini was an award winner in the 2009, 2010 and 2011 Code Project Members Choice Awards.