HDRIs

They’ve been around since 2006, but there’s a nice free collection of 35 HDRI skies from Evermotion (150Mb total) still available. They’re rendered rather than real, unedited, and are apparently a bit rough (untested) — but could be useful for reflections, sky backdrops and sky domes in iClone.

Averis have more free HDRI images, for non-commercial use…