The I2P development team is an open group, welcome to all who are interested in getting involved, and all of the code is open source. The core I2P SDK and the current router implementation is done in Java (currently working with both sun and kaffe, gcj support planned for later), and there is a simple socket based API for accessing the network from other languages (with a C library available, and both Python and Perl in development). The network is actively being developed and has not yet reached the 1.0 release, but the current roadmap describes our schedule.