OpenCores is the world largest community focusing on open source development targeted for hardware. Designing IP cores, is unfortunately not as simple as writing a C program. A lot more steps are needed to verify the cores and to ensure they can be synthesized to different FPGA architectures and various standard cell libraries.
There are plenty of good EDA tools that are open source available. The use of such tools makes it easier to collaborate at the opencores site. An IP that has readily available scripts for an open source HDL simulator makes it easier for an other person to verify and possibly update that particular core. A test environment that is built for a commercial simulator that only a limited number of people have access to makes verification more complicated.
Icarus Verilog is a Verilog simulation and synthesis tool. It operates as a compiler, compiling source code writen in Verilog (IEEE-1364) into some target format. For batch simulation, the compiler can generate an intermediate form called vvp assembly. This intermediate form is executed by the "vvp" command. For synthesis, the compiler generates netlists in the desired format.
The compiler proper is intended to parse and elaborate design descriptions written to the IEEE standard IEEE Std 1364-2005.
Verilator is a free Verilog HDL simulator. It compiles synthesizable Verilog into an executable format and wraps it into a SystemC model. Internally a two-stage model is used. The resulting model executes about 10 times faster than standalone SystemC.
Verilator has been used to simulate many very large multi-million gate designs with thousands of modules. Therefor we have chosen this tool to be used in the verification environment for the OpenRISC processor.
GHDL implements the VHDL87 (common name for IEEE 1076-1987) standard, the VHDL93 standard (aka IEEE 1076-1993) and the protected types of VHDL00 (aka IEEE 1076a or IEEE 1076-2000). The VHDL version can be selected with a command line option.
GNU Emacs is an extensible, customizable text editor—and more.
Very good support for both Verilog HDL and VHDL editing.
The GUI is written in java for portability. The backend code generation is written in perl for portability and ease of modification.
TCE is a toolset for designing application-specific processors (ASP) based on the Transport triggered architecture (TTA). The toolset 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.
TCE has been developed internally in the Tampere University of Technology since the early 2003. The current source code base consists of roughly 400 000 lines of C++ code.
Available is an online C to Verilog compiler. The code generated by the site is licensed under BSD (use it "as is").
Fedora Electronic Lab tries to provide a complete hardware design flow with the best opensource tools. We try to ensure interoperability as far as we can and we work with other opensource developers to improve existing EDA tools.
Fedora Electronic Lab web site
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