Alliance CAD System is a free set of EDA tools and portable cell libraries for VLSI design. It covers the design flow from VHDL up to layout. It includes VHDL simulator, RTL synthesis, place and route, netlist extractor, DRC, layout editor.
The Open SystemC Initiative (OSCI) is a collaborative effort to support and advance SystemC as a de facto standard for system-level design. SystemC is an interoperable, C++ SoC/IP modeling platform for fast system-level design and verification
ECL is a system-level specification language for HW/SW designs and is based on Esterel and C. The ECL compiler parses ECL, writes Esterel and C, and uses the Esterel compiler to produce an implementation. Originally developed at Cadence Berkeley Labs.
C++ template classes for Multi-Value Logic support arbitrary precision and user defined Multi-Value Logic types. This library comes with pre-defined data types: integer, boolean, bit, logic, std_logic, bit_vector, logic_vector and std_logic_vector.
G2C (Geospatial to Civil) The LandGML Interoperability Experiment initiated by Autodesk, U.S. Army Corps of Engineers Engineering Research and Development Center, and Galdos Systems. this open source tool transforms LandGML into LandXML documents.
An Open Source Parser Library for parsing Verilog, System Verilog, EDIF and VHDL source files.
wxArt2D gives wxWindows applications sophisticated vector drawing functionality. It is based on a framework supporting multiple views within a hierarchical document. Supports drawing & (Graph) editing. In-output in SVG, GDSII, XML, easy to extend.