EZThreat is a very lightweight addon that uses the new api in classic to get your aggro % of your current target, so it's mainly useful for DPS classes. It is a single bar with your aggro % (at 100% you will get aggro) and a label that changes colors according to your threat.
I made this for personal use, but figured I'd share it on here.
When you first run the addon, I recommend using the command /ezt lost to center the text and bar on your screen, then use /ezt unlock to freely drag them around, and /ezt lock to lock them in place and save frame positions.
You can also customize the width and height of the bar with /ezt width NUMBER or /ezt height NUMBER:
example: /ezt width 250
