I have been using the Schedule package for most of the last decade to create my weekly schedules that I post outside my office door. As soon as I started using it, I noticed that 12 noon was denoted as 12 AM and not 12 PM (and midnight was also incorrect). I tried to contact the author with a bugfix, but he was not reachable at the address in the documentation; this was unsurprising, as the package was uploaded in 1997 and never updated. The last upload to CTAN from the author is from 2001, and they have no contact information available.
Although the source code specifically said that I was not allowed to make changes to the code, the package is so useful that I did so anyway, fixing the strange AM/PM issue that I had found.
I love this package. It's well-designed---except for the minor bug that I fixed. At what point can we consider a package on CTAN to become abandonware?