Monster Top List is a feature-packed, reliable and secure topsite script. MTL was developed from the ground up to be the best PHP toplist software available. Backed by a powerful MYSQL database, Monster Toplist can handle topsites of all sizes; from 10 sites to well over 1000 sites!

Price: $79 Version: 1.3.3 Platform: Unix, Linux, Windows

http://www.monstertoplist.com/

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PHP TopSites is a PHP/MySQL-based customizable TopList script.

Main features include:
Easy configuration config file; MySQL database backend; unlimited categories, Site rating on incoming votes; Special Rating from Webmaster; anti-cheating gateway; Random link; Lost password function; Webmaster Site-approval; Edit site; ProcessingTime display; Cookies Anti-Cheating; Site Reviews; Linux Cron Free; Frame Protection and much more.

Price: Free Version: 2.1b Platform: Unix, Windows

http://www.itop10.net/products/

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TOPo is a free TOP system written in PHP that works without MySQL database. TOPo is specially designed for web sites hosted in web servers that not offer a quality MySQL support.

Price: Free (GPL) Version: 2.1.120

http://www.ej3scripts.tk/

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and of course there are the bigger commerical ones like autorank