Here is another all-terrain unmanned ground vehicle that can travel on land and in water. It has a rugged design and traction tires to move through mud and over challenging terrains. The vehicle can be customized with sensors and manipulators for your projects.
Warthog has an on-board PC that runs ROS. It has a max payload of 272kg. It can move as fast as 18 km/h on land and 4 km/h in water.