RE: Wizardry 6 only.... Cosmic Forge does not, so far as I can tell, let you edit your characters (although you can view them).
BUT I found a ye olde DOS editor that does the trick. It lets you manually set your skill points, increase your hitpoints, and raise all attributes to 18. (Unfortunatey it won't let you pick and choose attributes - it's raise them all to 18, or nothing.)
You can download it here:
http://www.mofunzone.com/game_trainers/wizardry_6.shtml NOTE: I do NOT endorse the site or verify its safety. But I braved it, and downloaded the software, and it worked.
The program won't run in modern Windows (even in compatibility mode) but it will run under DOSBox.
Read the Readme for instructions, command line usage, etc.
...
AND if you also (like me) then went looking for a grid mapping program, you may have also (like me) heard about something called GridMapper and then found that almost every link to it on the web points to a 404 error. However it does still exist and you can get it here:
http://www.superdan.net/software/gridmapper/index.html (Site owner rearranged his site but no-one updated their links.)
Hope that helps!
EDIT: Gridmapper's actually pretty rubbish for generating Wizardry maps, forget about it. Let me know if anyone finds something less awful.