Software for the DEC VAX
VAX software status:
VMS (includes ELN)
Bitsavers has captured most of the VAX-VMS manuals:
HPE, which absorbed DEC, maintains on-lime documentation for some versions of VMS
VMS Software Inc. licensed VMS for Alpha, Itanium, x86 and future architectures from HP. Although it did not licens VAX-VMS, the documentation that it maintains is largely applicable.
Bitsavers has captured most of the Ultrix manuals: