From aaareadme.txt:
Say, what is this? ODS2 is a program to read VMS disk volumes written in VMS ODS2 format.
What can it do? Basically ODS2 provides cut down DIRECTORY, COPY and SEARCH commands for VMS volumes on non-VMS systems. These can be used to find out what is on a VMS volume, and copy files onto the local file sytem.
See aaareadme.txt and aaareadme.too for more information.