DNS Client
Performs DNS queries independant of local machine configuration.

Generic Disk-Based Database Utilities
Reimplements the $generic_db as an interface to the GDBM server extension pack.
Permits storing large databases outside the MOO db, saving disk and memory space.
SMTP Server
Provides full Internet email service to the MOO.
Players can receive mail to their character objects, and (those authorized to do so) can send outbound mail.
Depends on the DNS Client to perform host lookups.