Viz-People released today free non-commercial version of VizPeople HDRI v1. It contains 10 half-sized resolution spherical environmental maps of the original commercial pack. These are full 360 HDRI skydomes that you can use to light up your scenes.
You all probably know VizPeople before from their cut out people libraries. Here is the link you can see the catalog of their first HDRI collection. The free maps you can download here are 6000px X 2900px and are for non-commercial use only. The full 12000px X 5800px size commercial maps can be purchased directly using the link at the bottom.