There are third party repositories with software for RHEL that's not supported by Red Hat. Most notably, EPEL, which ships loads of software from Fedora.
Smack and tomoyo are kernel modules, which are not permitted in Fedora. There's another community-maintained repository, RPM Fusion, which would allow it though. If anyone needs tomoyo or smack for RHEL, he's free to add it to RPM Fusion.
The community around Fedora and RPM Fusion is quite supportive, if a packaging experience were a problem.