There are many for professional graphic design and image editing. Adobe Photoshop and Illustrator are a few examples. These are the mainstream tools that almost every professional in the field uses.
Inkscape is an open-source tool that is used by many people in the field. It is available for both Mac and the Windows and is a very versatile tool to have in your arsenal. It is easier top use and is very powerful. It can be used design logos and create illustrations for you website or app or almost anything you are building. There are lots of tutorials available online too for getting used to it.
Inkscape can be downloaded from here
https://inkscape.org/en/release/0.92.3/