64 BlazeTerm by Mark D. Rejhon is one of those gems you run across and ask yourself, why haven't I heard of this before? This thing is amazing! All credit for this discovery goes to Andrew Wiskow of Cottonwood / Borderline BBS fame over at http://cottonwoodbbs.dyndns.org/ .
If you've used CGTerm for calling C64 telnet BBSes, you need to give this program a try. Although it's a DOS program, it runs PERFECT under DosBox and is super easy to use. Fire up DosBox, when you get to a dos prompy, type "serial1=modem" hit enter then CD over to the dir you extracted BlazeTerm to and fire it up! Andrew Wiskow has a step by step tutorial HERE. Because of the nature of the Web, I'll also put a copy of the tutorial on this website in the Reference -> Manuals -> Software Manuals section.