Port Map and TCMPortMapper
The Coding Monkeys (of SubEthaEdit fame) have been kind enough to release what looks like some very nice open source code for doing port mapping in Cocoa apps. It could be very useful for indie developers who want to provide “Back to My Mac”-like functionality.
Kudos on the slick web design for the project as well—it’s a lot more fun than the usual link to a Google Code site.