I was a big fan of SAFARI. Popped up that big scary red screen with lots of interesting info.
Of course, nowadays, the "intercept anything, do with it whatever you like" mindset is, at best, a security nightmare, and in any case an adware vector. "Hey, you just had an read error on your Seagate device... Don't you know Micropolis does a lot better?"
So, rightfully so. But I still miss those days...