Contracts
Miles posted some interesting links to contracts-related software projects in the enspiral G+ community. I'm linking them here to come back to later.
http://codius.org/
http://orisi.org/
http://www.commonaccord.org/
I also believe the DemocracyOS have some involvement with Legal Markup Language
Contracts are also part of our core model, although we have not developed them yet, and they are just a sketch in the ISO standard. Looking at Codius for where to go with the idea. That would bring contracts into a full economic model.
http://jtc1sc32.org/doc/N1051-1100/32N1083-CD15944-4-wg1n266.pdf figures 14 + 16 in the appendix, for example