You can always use the viewcube...but afaik there are no built in hotkeys you can use to snap the viewport like in ZBrush. That said, it shouldn't be too difficult to script viewport rotations, the biggest issue is determining the pivot to rotate around since if you get it wrong the selected objects/components will fly off…
There's no option to do this by default. I've made.myself a script that automagically snaps my camera.to closest ortho plane, when rotating to +-15 degrees from the view.