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.
ManagedFusion was built on the idea of having a single Web-Portal Core, that handles modules, security, themeing, and localization. A CMS, ERP, or CRM can be easily created with this powerful framework. Mono and .Net are supported.
KAYM - Knowledge Management
A SETI@Home/BOINC client watcher! User statistics powered by BOINCStats. But now built with the .NET environment.
Webstensible is an extensible application layer for building robust, web-based business applications. The framework is written in DotNet. All components are loaded via reflection and designed to be replaced to match ever-changing business requirements.