Only one of them is mine, but I've been taking care of cars that aren't mine (family/friends) for quite some time so I will post everything that I am currently changing the oil on.
2002 Pontiac Grand AM (my daily driver)
Rotella T 15w-40, changing out with Amsoil soon for the winter. Coolant-ingress UOA's leading to very short OCI's.
2004 Mazda 3
Halvoline 5w-20, fits warranty spec and shows great UOA and a happy amount of moly.
2002 Chevrolet Trailblazer
Mobil 1 5w-30, just got a great UOA at 7,608 miles, so I'll stick with it.
1999 Pontiac Grand AM
Halvoline 5w-30, never had a UOA but it's one of two oils it's had since it's first change.
Onan generator with Briggs engine - Halvoline 10w-30 Consumes too much to use synthetic oil as it's not completely broken in yet.
Toro lawnmower with Briggs engine - Halvoline straight 30 Will get a HDEO 15w-40 for next season.
I have just realized that every single engine has a different oil.