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.
The database
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.