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I'm a casual user of these plugins, but based on naming, the depth cam would generate information akin to the openni_camera, while the gazebo_ros_prosilica is probably a precursor to the gazebo_ros_camera, but they both should "[follow] the standard ROS API for camera drivers."

According to the gazebo_plugins wiki, the gazebo_ros_camera generates information akin to the wge100_camera.

As a note, do not be surprised if you find code that does essentially the same thing in multiple places, with different names. Hopefully they all get the documentation they need so people can find them before reinventing what's already been done. In a federated environment like ours though, this cannot really be avoided, it will just need to be managed.