y-notes is a set of lightweight applets and CGI scripts which enables a webmaster to specify points where the website's visitors may leave 'sticky notes'. The notes are kept on the server so that users can retrieve them at a later time and use them as a navigation aid. y-notes are particularly useful in large sites such as tutorials and reference manuals. They can also be used in web pages as a fairly uncomplicated way of gathering user feedback which requires no registration, logins, or passwords.
yaDMS (yet another Document Management System) is a PHP-based document management system, with many features like a clipboard, conversion of mail to DMS, conversion from DMS to mail, zip & download, copy, move, multiuser, and full-text searching with support for various document formats.
yaGTD is a very simple utility designed to make the management of your to-do list quick and easy. It incorporates major features from Allen's Getting Things Done philosophy and a notion of urgency and importance preached by Stephen Covey in his Seven Habits of Highly Effective People book.