<i>AOL has released partial specs for parts of OSCAR but neglected to include the sections necessary for ICQ compatibility, and there is an obsolete draft RFC for MSNP. Both of those protocols have been reverse engineered and documented fairly well, but there are no open source implementations suitable for use as jabber gateways.</i><p>Sorry, but that's just not true. OpenFire has an excellent <i>opensource</i> IM gateway plugin with support for all of the protocols he mentions. The only one still missing from the open source community is Skype.