Oldest programs you use

What is the oldest program on your computer?

Classic Unix utilities and DOS games do not count.  I mean programs that you still use on a regular basis and that still have some utility or amusement to you.

I still use iPhoto Plus! 4, an old program that came with my since-dead EPP scanner.  While not full featured, it's fast.

I use ACDSee 2.42, it's WAY better than any of the later versions, which are totally full of epic fail and aids.

I also use WinAmp with the classic interface. The only reason I needed to upgrade from v2 was that I couldn't find a MOD plugin, but v5 supports that format natively.

And I keep a Portable Apps version of Firefox 1.0 and 1.5 for handiness and skinny browsing.