Yes, that's right. HP ported and included some Open Source software in the later releases of MPE/iX!
Included are a number of scripts/wrappers/utilities either recently added or updated such as to 'round out' the Posix implementation - to make porting easier & more robust. Major packages (BIND, Samba, etc are listed in the 'Packages by Name' menu).
Here's the alphabetic list of software currently available: