GeoSynchrony GIS framework. You can try before you buy. It can be used for production planning. Very reasonably priced. I can't imagine working without it anymore.
Packages are either reusable code or programmer tools.
Add links to new packages and add your comments about the ones already here. Try to put a link on one of the topic pages listed at the top of this page. Only put it here if it doesn't fit any topics. When this list gets too large, someone will split it. Try to say a little about the link, like what version of VisualWorks it uses, and whether it is just an interesting prototype or is useful code.