Qol Tools: Camera Bookmarks lets you snapshot angles in Blender and switch between them without keying or animating. Adding a bookmark is a single click: it detects the 3D view and adds either a perspective bookmark or a camera bookmark automatically. The add-on stores nearly everything about the camera or view, leaves your animations unaffected, and saves the bookmarks with your file.
Restoring takes one click regardless of camera or perspective type, automatically switching camera types and restoring all the stored settings. You can update a bookmark to a new angle with the up arrow, create as many as you like, and name, update or delete them directly. A mini button works even when the panel is closed: click to cycle through bookmarks, Ctrl-click to create a new one.
The panel can be shown as an N-Panel or in the Properties panel, set through the add-on preferences. It's compatible as a Blender extension and released under the GPL license. Blender also includes a built-in camera bookmarks add-on, though that one lacks the mini button and hotkey capability.