TTA-based Co-design Environment (TCE) is a toolset that provides a complete co-design flow from C programs down to synthesizable VHDL and parallel program binaries. Processor customization points include the register files, function units, supported operations, and the interconnection network.
rgbproc-repository is intended for use with Xilinx EDK tools. It consists of many units written in VHDL that can be used to build a design for image/video processing. The backbone is the data bus (called simply RGB) that is used to pass data (typically) from VGA input to VGA/DVI output.
Controlix is a control theory based operating system. It abstracts the complete abstraction hierarchy of computer systems principles, from basic signal-on-wire all the way up to abstract libraries and interface linkage. It is written in the VHDL language and is designed to be modular, synchronous, and retargetable.