I don't know if this is comprehensive, but this article has at least some of the mods added. https://www.eurogamer.net/heres-eve...cher-3-next-gen-patch-while-at-cd-projekt-red
One nice change I saw in the article is that you can fall further before you trigger damage.Mods made by the community include World Map Fixes by Terg500; Nitpicker's Patch - Various Visual Fixes by chuckcash; The Witcher 3 HD Reworked Project by HalkHogan; FCR3 - Immersion and Gameplay Tweaks by Andrzej Kwiatkowski; and HDMR - HD Monsters Reworked Mod by Denroth.