CodeWeavers is a company that sells a proprietary version of Wine called CrossOver, for running Windows applications on Mac OS X and Linux. The company was founded in 1996 as a consultancy, eventually moving entirely over to Wine development and support. The CrossOver version of Wine is regularly refreshed with the latest free Wine patches; likewise, patches from the company's employees are sent back to the project almost immediately. This distinguishes the company from TransGaming, which develops a forked version of Wine called Cedega, and no longer returns contributions to free Wine. CodeWeavers is a major contributor to the Wine project, a free software / open-source software project that helps Windows applications run on different x86-based operating systems, and employs the project's maintainer, Alexandre Julliard, as their CTO.