Hi guys, I am the author of Photopea.com. It is a full PSD editor (it can open, edit and save PSD files with ALL features inside them). It can also open Sketch, SVG and PDF, and save them all as a nice PSD. And it works in a browser.
I just added a new feature - opening XD files (from Adobe XD, which runs only on macOS 10.11 and Win10). So if you ever get an XD file and don't know what to do with it, you can open it instantly in Photopea. And it is completely free, without any sign-up nonsense :)