A home base for Lego hobbyists. BrickBase allows you to launch Lego-related applications easily. BrickBase has built-in Interfaces for mklist, L3P and LSculpt.
VTK.NET is a .NET wrapper for the Visualization Toolkit. With it, you can write Windows Forms applications in C#, managed C++, Visual Basic, or J#. It includes a Windows Forms Control for drag and drop design of forms.