有啥免费的仿真器没

spice3?
不过eda领域里面，基本没有能用的开源软件吧
本来市场就小

可是如果你真要做这个工作的话，公司里仍然是要用NC/VCS/Modelsim啊。

Free Simulators
Icarus Verilog : This is best Free Verilog simulator out there, it is simulation and synthesis tool. It operates as a compiler, compiling source code written 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. Icarus continues to get better and better. Icarus is being used for real design work by companies now as a simulator, and is starting to be useful as a synthesizer for a Xilinx FPGA flow as well. All my tutorials are compiled on this compiler.
Verilator : Verilator is a compiled cycle-based simulator, which is free, but performs as fast as the commercial products.
Cver : Cver is an interpreted Verilog simulator. It follows the 1995 IEEE P1364 standard LRM with some features from Verilog 2000 P1364 standard. Although, because it is used in large company design flows, various changes from the P1364 standard have been made to match results of other simulators. It implements full PLI including PLI vpi_ application programing interface (API) as defined by Verilog 2000 LRM.
Verilogger : The evaluation version is a free 1000 line free Verilog simulator plus an automatic test bench generation tool. Student versions start at $70 for 6 months.
Veriwell : This is a very good simulator. Supports PLI and verilog 1995.