GitHub is like a second home to many designers and app developers. It's a web-based platform for publishing and sharing various software development projects. GitHub is being constantly improved and updated with new features, for example support for viewing PSD files that has been introduced just recently.
It's a small change, but we welcome it with open arms. Designers and developers no longer have to download PSD files to view them. After the update, GitHub allows them to display them inline, like regular images and photos. Additionally, thanks to three new viewing modes, they can easily see what's changed in a commit.
For more detailed information, visit GitHub's help documentation.