Advice Needed Looking for Directory Software



Hi all,
I am looking for a directory software to install on my server (not online directory websites who charge a lot of money).
I have already a directory website which was built few years ago and I want now to update the listings and can either use the same software (free) but their latest version or design from scratch with something better even paid version.
Please let me know if you can recommend a directory software if you have good experience with it, or ask friends who have directories and are willing to share which software they are using.
Thanks for your help.