LDMud is an LP-class MUD engine, meaning it is object-oriented, with all object clases stored in unique files. The engine runs compiled bytecode to manipulate those objects, and the underlying simulated processor is a stack machine. It is a 3rd-generation LP-class MUD, being derived from Amylaar, which in turn was derived from the original LPMud. The game has no limitations on the nature of the game space other than the limits of your coding.
DM CryptFS provides helper tools for setting up swap partitions and filesystems using the device mapper crypt target of the Linux kernel 2.6.4 and later. A configuration file lets you specify the layout of the encrypted storage and key derivation. Some scripts are provided to make it interact nicely with hotplugging.