Craftsman V20 (impact, Sawzall, and the wimpy POS weedeater that only gets used around stuff I don't want to destroy with the Stihl FS40C and 70R).
Hitachi 12V Li-Ion (my grandmother's impact and drill--given as a gift to my grandparents in 2009, used and abused ever since, and still going strong). I use them a lot too, as I have yet to buy my own cordless drill--my ratcheting braces and Millers Falls 2-A have been adequate for most stuff out of range of an outlet.
Hyper Tough 12V MAX--my little impact. Not bad for $30, and Walmart has a huge range with them. They have a tool similar to Milwaukee installation driver, as well as a Hackzall copy I have kept looking at. Lost my adapter, so I might as well buy the fast charger.
DeWalt 18V. Wondering what to do with it, since the batteries are toast. I've got a Sawzall, drill, impact, and light. Not sure if getting the adapter for modern batteries is worth it.
Wanting something better 12V--currently a little stuck between the Bosch on sale at Tractor Supply, or saving up for Milwaukee M12 FUEL.