If you want to open a Photoshop file without Photoshop, you can use a program like Adobe Illustrator or Inkscape. Adobe Illustrator allows you to open PSD files with just a few clicks, and Inkscape is a free program that can open most PSD files.
There are several softwares that can edit PSD files, like Premiere, After Effects or CorelDRAW. Nevertheless, Freepik recommends Adobe Photoshop, the industry standard.