Many of the reusable utility classes we developed to build Calvin, along with other related classes useful in agent/AI research, have been released in the IGLU Java source code library, available from http://www.cs.indiana.edu/~trbauer/iglu. It is released under a FreeBSD-like license. We welcome suggestions and contributions.
Some of the other components used in Calvin are also freely available.
back end, Postgresql is an open source project released under a FreeBSD-like
license and is available for download at http://www.postgresql.org. Numerous
XML parsers are freely available for Java. Calvin uses XMLtp, available from
http://mitglied.tripod.de/xmltp. XMLtp is also released under a FreeBSD-like license.
The full Calvin toolkit has not been released. However, we welcome discussion on possible cooperative efforts to use and enhance the toolkit for greater use.