https://en.wikipedia.org/wiki/Category:Computational_chemist... lists quite a few, and some of them are links to additional software lists, like https://en.wikipedia.org/wiki/List_of_molecular_graphics_sys... .

There is so much software because there are many different needs, each with specialist requirements. Most likely you want to look at PyMol. However, even though that's one of the more approachable packages it will require some domain knowledge.