beside them are uploaded
to my account, so the links to the files are guaranteed to work.
Others point to their official download locations, which may
change occasionally (thus no guarantee that they will work). I'll
try to update this page as often as possible. But as an
undergraduate, I have to attend lectures, do projects, finish
tutorials, etc. So the descriptions may be outdated. You might
want to visit the author's homepage (if available) to see whether
there's a newer version of the file you want.