wolfadeus - 3:55 pm on Aug 8, 2012 (gmt 0)

phplinkdirectory was the market leader when I looked into doing a directory five years ago, which comes with the advantage of a large community and good support as well as loads of add-ons.

More important than the choice of software will certainly be the marketing research to be done before you start - there are loads of directories out there and you need to offer a USP that allows you to stand out from the crowd. Good luck!