A Upup is a Puppy that has some compatibility with Ubuntu. Typically produced using Woof with Ubuntu packages. Often they are named after the Ubuntu version name, for example Lucid, Jaunty and Precise

Lucid popular Upup and official community Puppy from version 5.00 to 5.28 developed by playdayz, see latest version forum thread

PuppyPrecise developed by BarryK, see Precise Puppy beta7 announcement
Ov-Precise 5.3.0 developed by Oldyeller, see Ov-Precise 5.3.0 thread
Upup Precise developed by pemasu, see version Upup Precise 5.3.3.3 with kernel 3.3.2 thread

Jaunty Puppy Alpha9, developed by BarryK, see Jaunty Puppy Alpha9 feedback