There are 2 repositories under sip2 topic.
Java Implementation of the 3M SIP2 and NISO SIP3 Protocols for library self-check applications
BIC Library Communication Framework
Java-based Library Self Issue Client which can issue and return books via the 3M SIP2 Protocol
SIP2 Server which mediates requests between SIP clients and ILS HTTP back-ends.
Circulation client for Nashville Public Library / Limitless Libraries circulation staff using SIP2 and CarlXAPIs
PHP Client-GUI for testing SIP2 (Standard Interchange Protocol) communication as used with SelfCheck systems or library automation system dealing with patrons or library materials. Supports TLS and Gossip extension.
SIP2 proxy server which can also modify the SIP2 data on both ends (request and answer)..
An OpenSource Selfcheck system that is FAST, intuitive and - Free Software! Enhancements against the code from code.google.com/p/open-source-self-check