>>1489224What exactly do you want to do with the stuff? Usually you burn twigs and such things on a bonfire. If that's illegal where you live, doesn't your local government provide green/compost removal on a monthly or bi-monthly basis?
The most effective manual tool for snapping twigs = hands
The most effective manual tool for snapping larger twigs = loppers (pic related)
The most effective manual tool for processing even thicker wood = saw