VHD2VL - free and opensource translator for synthesizable VHDL into Verilog 1995/2001. It does not support the full VHDL grammar - most of the testbench related features have been left out. Syntax and semantics are not carefully checked. vhd2vl assumes that the input is error-free.
Vhd2vl is written using lex (actually Flex), yacc (actually Bison), and C.

The most important VHDL constructs missing from this version are
◦ packages
◦ structures
◦ functions
◦ strings
◦ attributes

Project page + sources

#VHDL #Verilog #converter #translator #flex #bison