Rojak Design are well known for their range of ladder safety devices, the most famous of which being the stopper feet featured below. Their products are designed to reduce the risks of slips and falls when working at height.
The Rojak stopper base stabiliser is designed to stop a ladder sliding out at the bottom, which is achieved by vastly increasing the surface area in contact with the floor. Rather than two small rubber feet, your weight is spread across the large rubber base that covers the T shaped aluminium section, making slip or flip a thing of the past. It also means that you don't need to have someone footing the ladder while it is use, allowing them to do something more productive.