I have several projects in the Google Developer Console where I am only a viewer. Can I remove myself from them, or hide them?
At present, once you've accepted an invitation to view a project, you can't remove yourself from the project, as Project User Management is the owner's / owners' exclusive right. By extension, these projects can't be removed from / hidden in your Developers Console neither.
What you wish to accomplish goes through contacting the individual project's owners, and request they remove your access.