TNC
OpenSEA
http://www.openseaalliance.org/index.php?option=com_frontpage&Itemid=1
Open1X
http://open1x.sourceforge.net/
LIBTNC
https://sourceforge.net/projects/libtnc/
HOWTO on EAP/TLS authentication between FreeRADIUS and XSupplicant
http://www.missl.cs.umd.edu/wireless/eaptls/