The big tree is a Desert Museum Palo Verde - a Parkinsonia hybrid that unlike most Palo Verdes is thornless.
The Agave to the upper right of the first Agave vivipara is a hybrid of Agave colorata and Agave bovicornuta, but not at all similar to the popular Agave x 'Mad Cow' which is a hybrid of the same two plants but as far as I am aware with the seed and pollen parents reversed.

There are some other unidentified plants, but they are pretty small so probably not worth mentioning here.