Aside from hardware there are the more fuzzy areas in the embedded/hardware world where Open Source can make a lot of inroads - anything from Firmware through to VHDL/Verilog designs for FPGAs.<p>The later is useful because it's more accessible in a way - you have a standard Altera or whatever board, and simply upload your design to exercise it. You can also simulate, debug, etc. This puts it on the software end of the spectrum, but ongoing wins here will eventually broaden.<p><a href="http://www.opencores.org/" rel="nofollow">http://www.opencores.org/</a> is already doing some good work on this.