I'm an FPGA guy by day, we use VHDL exclusively at work and I've yet to find an open source alternative (gHDL etc) that holds a candle to the paid (or free but limited) tools.

I am new to VHDL programming (although I've programmed in other languages like C++, java, etc.). I've been searching the web for help in writing a 4 bit multiplier (i.e. 0111 x 0110). I found ...