This is a Minecraft server that runs inside of OpenComputers, so a Minecraft server in Minecraft.
To run the server you first need to un-blacklist "localhost" in OpenComputers configuration.
Now run the bridge software (it's Java code, so you'll need a JVM, i plan to create a .jar soon) and the setup is done.
Now you can just copy the usr directory to your OpenComputers computer, type mc and then press Enter. Voilà! You got a Minecraft server ready at port 25565 on your localhost.
(Note: if you want it to be public, you'll still need to port forward your router.)
Note: wiki.vg was used to make this.