TNC@HsH is an open source implementation of the TNC architecture.
TNC@HsH implements many core TNC components and the main interfaces between them, which can be viewed here. They created irondetect, an IF-MAP tool. Various capabilities and iterations, please visit http://trust.f4.hs-hannover.de for more information.
Irondemo is a set of shell and Perl scripts as well as some resources, to build an environment containing IF-MAP based software from scratch, additional information can be found here.
Also, they offer visITMeta, which is a data visualization tool for IF-MAP, available here