SELinux is described as 'Security Enhanced Linux (SELinux) is a role-based access control solution, developed by the US spying agency NSA and Red Hat, for internal and general use' and is an app in the security & privacy category. There are four alternatives to SELinux for Linux. The best SELinux alternative is AppArmor, which is both free and Open Source. Other great apps like SELinux are grsecurity, TOMOYO Linux and Smack.
A Mandatory Access Control (MAC) system which is a kernel (LSM) enhancement to confine programs to a limited set of resources.
AppArmor is the most popular Linux alternative to SELinux.
AppArmor is the most popular Open Source & free alternative to SELinux.
Grsecurity® is an extensive security enhancement to the Linux kernel that defends against a wide range of security threats through intelligent access control, memory corruption-based exploit prevention, and a host of other system hardening that generally require no...
grsecurity is the most popular commercial alternative to SELinux.
TOMOYO Linux is a Mandatory Access Control (MAC) implementation for Linux that can be used to increase the security of a system, while also being useful purely as a system analysis tool.
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AppArmor is easier to administer, but isn't a 1:1 replacement. MAC and RBAC are not synonymous. Additionally, AppArmor does not include security information for each data object based on what it is, but is based on directory structures or where things are. They are different approaches to a similar problem with different use cases.