All HDRIs are licenced as CC0 and can be downloaded instantly, giving you complete freedom.
No paywalls, email forms or account systems.
HDRI 100% Free
HDRI Haven is creating free, high-quality HDRIs for everyone
HDRI Partly Cloudy
HDRI High Contrast
HDRI Medium Contrast
HDRI Low Contrast
HDRI Natural Light
HDRI Artificial Light
HDRI resources by Greg Zaal, CG artist and Open Source advocate.