The first two are damselflies. The great spreadwing and the Comanche dancer belong to different families of damselflies. Unlike most damselflies, spreadwings hold their wings out from their body when at rest.
Great spreadwing, Archilestes grandis
Comanche dancer, Argia barretti
The dragonfly is a a black setwing, Dythemis nigrescens, a mostly Mexican species.
All were photographed at the Zilker botanical gardens in Austin. Click to enlarge any photo.