Here's my free fractional-N frequency divider generator program.
Version 9 generates VHDL and Verilog, and has been stable since December 2001.

Free Download, version 9 (generates VHDL and Verilog)

Free Download, version 8 (generates VHDL only)

Free Download, version 20 (written in pure VHDL, but doesn't work with most synthesis tools)