I don’t note it enough, but Tomohiro Kusumi has been making constant updates to HAMMER, the version we have now.  Often they are the sort of update that makes the code more readable, or fixes possible problems, and so on.  Very essential, but hard to post about it.  In any case, I’m using his recent improvements to hammer volume-del to note his contributions, of which there are much more than the day’s worth I link here.