Search google there is a lot!! There is also some free ones that are as good as the payed ones. - Prilep
Here is super secret link that will help you to find directory script: Secret Link <---Its my high paying affiliate link
im using skalink directory script and im very happy. This script fast and very useful. Regards, Mustafa
Look at this thread it might help out alot! http://forums.digitalpoint.com/showthread.php?t=9442&highlight=directory+submitter - Prilep
phpld is considered the best by a lot of people. I am impressed with a relative newcomer indexscripts.com eSyndicate is yet another.
You could try out the directory script (PHP/MySQL) that I put on sale, there is a demo available: http://www.idealprogramming.com/ideal-programming-link-dir.product
Very suprised www.phplinkdirectory.com has not been mentioned yet. It is the most widely used, and has lots of mods and a great community.
try this www.freephpdirectoryscript.com But the best is www.phplinkdirectory.com which has the best script and also it is best for only directory owners
For some reason it says you are not allowed to receive PMs crownrahul. I received your pm about wanting a demo, so here is my reply: http://www.phplinkdirectory.com/forum/showthread.php?t=4966&page=2
phpLD is probably the most popular choice out there. I just purchased the script a few days ago and I've used it for my first web directory. Love it. Try it, its highly recommended.
Oh...another non-specific question. Best script for what. What kind of directory do you want to develop? And what for (submissions, link exchange, content creation,....)? what platform are you going to use (Linux, Windows)? Without specifics....guess what.