gputils is a collection of tools for Microchip PIC microcontrollers. Its goal is to be fully compatible with Microchip's tools, MPASM, MPLINK, and MPLIB.
Mixed Analog/Digital Simulator framework - parser and elaborator for Verilog and Verilog-AMS, and an extended C++ (ParC - http://parallel.cc) to be used as the simulation engine.
Verilator converts synthesizable Verilog HDL modules into SystemC modules. This enables users with Verilog code to have a publicly available co-simulation environment. For all information, see http://www.veripool.com/verilator.html.