icarus is slow and has no intention of supporting SystemVerilog, last time I checked. Other interesting projects:

http://pyhvl.sourceforge.net/ http://www.myhdl.org/doku.php/start

I couldn't get pyhvl to work, reported a bug, and got no response.

For verification there should have been effort expended on creating libraries for existing high-level software languages and on interop between those languages and simulators, not on creating our own iffy language (SystemVerilog), and then a huge library to work around all the deficiencies and impedance mismatches between the language and the problems we are trying to solve (UVM).