What can run on a virtual console except getty and X?

So I know about linux virtual consoles, about how you can access them with ctrl+alt+f#, and I know that consoles 1-6 run getty and console 7 typically runs an X server, but that got me thinking about what else can run on a virtual console? Is there a way to create software that would run on a virtual console? Are there any tools for that? Is there maybe a way to run a C program on a virtual console or something like that?