There's long been community-based projects to create an open-source GPU design at the hardware level, but these open-source graphics card designs have ultimately failed not to mention being years (or in many cases, over a decade) behind AMD/Intel/NVIDIA in their graphics capabilities. Kickstarter-based open-source GPUs have also not panned out thus far. Launched this week though is now the source to a new 2D/3D graphics engine design based on the project that hoped to raise a million dollars for its work.
The "GPLGPU" source-code is out as a GPLv3-licensed Verilog design to a graphics engine. The design is around a "circa 1998 graphics processor" while portions of the code have been updated. Commercial licenses to the GPU design are also said to be made available.
Those wishing to learn more about this design that could be incorporated into a PCI VGA device, there's a blog at GPLGPU.com documenting the work while the code is hosted on GitHub. The Verilog was tested on a Synopsys VCS simulator and the Mentor Graphics Modelsim Questasim while it should be possible to develop an ASIC around it or run it off an FPGA.