A multi-lingual yellowpages module for use in PostNuke [Open Source, GPL].

A simple image gallery featuring web admin tool, template system, user comments, visit statistics and multilingual support. Requires GD lib, but no SQL. [GPL]

A free guestbook system that does not require an external database. Features: edit/delete messages, fully customizable appearance through a theme system, admin notification and custom timezone.

Full-featured YAML parser and emitter. Use as drop-in replacement for PStore, or use one of its several APIs to store object data in friendly and readable YAML style; write data structures in plain text.

Open-source initiative to provide free POP3 access to Yahoo Mail accounts. Available for Windows and Unix.

Perl application that simulates a user's actions to download their Yahoo e-mail to their local inbox. Supports SSL, multiple accounts, and localized interfaces.

Yet Another Eiffel Sockets Library

xWire is a mature, object-oriented, enterprise-class open source AJAX toolkit that contains numerous useful features and widgets.

Freeware server allowing external processes to determine access (as from a database or other source). FAQ and mailing list information as well as downloads. [Win32]

Get some kind of WYSIWYG in LaTeX and HTML source.