Into the modern age

I finally got a monitor for my VS3100 m38 and was playing with DecWindows all night. Really cool. One thing I'm a bit surprised by is the speed of the video being much faster than I'd imagined it would be. Now to get some software to run on it; I've found some stuff already, but can someone point me at some share/freeware software to run under DecWindows (besides the DECUS archives)? In particular, I remember using an ephemeris program in school that I could swear was freely distributed. And a couple more questions for the experts: Does the DECUS hobbyist license cover all versions of VMS/DECWindows? I'm running 5.2 on this machine; would upgrading to 6.1 noticeably degrade performance? Would additional features balance out any slowdowns? Besides new features, my entire manual set is for 6.1... Aaron