free CAPTCHA script to prevent automated bots and spam submissions. More captcha scripts
Active PHP Bookmarks (APB) is a web-based program that allows you to store your bookmarks and display them in many useful ways. It will sort your bookmarks with usability in mind, keeping often- used bookmarks at your fingertips. It has a bookmark search, private/public bookmarks, nested groups, usage rankings, popularity sorting, and a quick add feature.
Feed Me Links is a Web application for managing and sharing links. It provides many interesting features such as tagging, comments, RSS feeds, tag clouds, friend lists, a REST API for exporting, a browser sidebar, and Firefox and IE favorites import.