Heck ya, Sidekick! I remember writing html in sidekick in high school. Until my files got larger than 2k anyway, that was the largest file sidekick could handle. Then I had to switch back to edlin :-(.
For whatever reason, everywhere I went they were using ACT!
(Salesforce killed em all for a reason.)
Memories. I remember the sales staff in particular were disturbingly devoted to Act!, and as the IT guy any time Act! hiccuped, it was a crisis. More than one occasion of a corrupted database resulting in real tears and more than one angry encounter and one actual fistfight resulting from accusations of one salesrep pinching anothers database.