LFSR Counter Generator Up to 63 bit, Cross-Platform Compatible
LFSR Counter Generator is a command-line application that generates Verilog or VHDL code for an LFSR counter of any value up to 63 bit wide. The code is written in C and is cross-platform compatible.
There is an online version of the tool at OutputLogic.com
It's more convenient to access, but the online tool is slower to generate the code for large counter values.