Blocks SpaceKits are a software development kits that implement the Blocks eXtensible eXchange Protocol (BXXP) in a variety of programming environments. Currently SpaceKits are available for Java and Perl. More SpaceKits are currently under development at Invisible Worlds, Inc.

Blocks SpaceKits from Invisible Worlds
The Blocks SpaceKit for Java		Released into open source May 1, 2000. By Frank Morton.
The Blocks SpaceKit for PERL		Released into open source May 1, 2000. By Brad Burdick.