GroupServer is a Web-based mailing list manager designed for large sites. It provides email interaction like a traditional mailing list manager but also supports reading, searching, and posting of messages and files via the Web. Users have forum-style profiles, and can manage their email addresses and other settings using the same Web interface. It has supports features such as Atom feeds, a basic CMS, statistics, multiple verified addresses per user, and bounce detection, and is able to be heavily customized.
ACASUserFolder is a User Folder implementing the Yale CAS single-sign-on (SSO) authentication method. It features support for Yale CAS architectures 1.0 and 2.0, Plone support with a quick installer, POST and GET methods handling on session timeout, a test panel for easy setup, and online help.
Zenoss is an enterprise network/systems management application that provides an integrated software package for monitoring availability, performance, events, and configuration across layers (network, servers, applications, environment, etc.) and across platforms (Linux, Windows, Unix, etc.).
Virtual Collaboratory is a Web-based collaboration application that features a directed discussion forum based on Mailman providing for threaded short and long term discussions. It includes a calendaring function, integration with the Elluminate meeting software, document exchange, version control, a research resource center, custom categorizations, FAQs, and the ability to search for users with similar interests.
With Plomino, you can create your own specific applications in your Plone site directly from the Plone Web interface without Plone development. You can create and design forms in WYSIWYG mode. You can easily embed charts or maps. You can create specific actions. You can adapt the application behaviour based on the user access rights and roles in a very granular way. You can import/export your application structure and/or your application data over HTTP between remote servers.