Software/Website to jumble words or strings?

[Schoolbag]

Does anyone know of a program (win or Mac or PHP) or a website that can take a word (or a string of letters) and give back a list of every possible combination?

for example, I need to take the word "friday" and get a list of variations:

fridya
friayd
fryida

[victor]

Win, MAC, Linux, Amiga and more:

[rebol.org...]

eg:

print lexperm "friday" 400
friday fridya friyad friyda fryadi fryaid frydai frydia fryiad fryida fyadir fyadri fyaidr fyaird fyardi fyarid fydair fydari fydiar ..... etc