OmniPortal was built on the idea of having a web-portal-kernel, that could handle security, themeing, and localization. This means that you can create any web based system on top of OmniPortal (i.e. ERP, CMS, CRM) easily. Mono and .Net is supported.
Collection of plugins for Eclipse 2.1 (www.eclipse.org). Web-Application Development Environment (XML/HTML/CSS/JSP).
SibSoft CommuniMail is a mailing list manager and newsletter script. The goal of CommuniMail is that it's able to be installed on Linux or Windows server. It could be installed on server without mySQL database and use CSV files as a data storage.
JSPowerLin - Linux with a Java edge, a lightweight platform for developing and deploying J2EE applications and Java Server Pages on a server or servercluster.
Robust shell script to create backups and archives for websites.
The Nodepublisher is a set of Content Management System, which can manage web sites flexiblly, contents can be published with templates in different channels, support international web sites in different languages, though the backend is only in Chinese.
Collection of plugins for Eclipse 3.0 (www.eclipse.org). Web-Application Development Environment (XML/HTML/CSS/JSP).
This project has been supplanted by SyntaxCMS, available at http://www.syntaxcms.org/
mojoPortal is an accessible, compliant, extensible, cross platform, cross database, content management system CMS written in C# ASP.NET. If you know how to make an ASP.NET UserControl then you already know how to make a feature that plugs into mojoPortal
tomato's Web Application Common Components -- project aimed on building commonly used components for web applications.