Open Source Solid Modeling CAD
BRL-CAD is a powerful cross-platform constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing for rendering & geometric analyses, network distributed framebuffer support, image & signal-processing tools.
The PureSecure Plugin Factory Project focus on the production and share of Demarc PureSecure Extensible Service Monitoring (ESM) Plugins . They can be wrote in any language you want. Demarc PureSecure is free for non-commercial use.