GUI for John Fine's MakeHex. Unzip to the same folder as MakeHex and run from there. There is no install, but it requires .net framework to run (most Windows OS's have this already). It mainly just saves you the effort of sifting through IRP files and copying/editing them.
It requires stricter formatting than MakeHex which means Device, Function and Define (5 max) must be together. Otherwise edit manually in this GUI.