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In researching this U&L Q&A titled: permission denied for ptrace under GDB, the question came up, "Is there other software similar to SELinux & AppArmor?".
User @IwillnotexistIdonotexist mentioned 2 that I'd never heard of: Smack & Yama. He found them by searching through the Linux source code. So now we're up to 4.
Are there others?
In searching for Linux Security Modules, I came across the wikipedia page, titled: Linux Security Modules.
These are the following LSM's listed there:
Of the modules listed, the first 4, SELinux, AppArmor, Smack, and TOMOYO Linux are the only ones accepted into the official Linux Kernel, since version 2.6.
There is also grsecurity. grsecurity isn't a LSM system per se, rather, it's a set of patches to the Linux kernel, all focused on security. Looking at the Wikipedia page, the project appears inactive (last stable release only works on kernel source trees up to kernel 3.2.50, and the latest preview release only works up on kernel source trees up to kernel 3.4.4).
