Big fan of Jetplan myself.
My current company uses Navtech Dispatch pro.
Hated it at first as it was very clumsy to use.
Still do not like the FOMS section of the program as it is appears to be based on a DOS system.
System is ideal if you have a 2-5 aircraft doing long haul flights as it does take a bit of time to do a flight plan and file it.
Or is it me thats a bit slow.....!!!!