Slope analysis toolkit is a custom script in grasshopper which helps evaluate slope areas {eg. Area coloured green equals 243 sqm and is less than 10% slope} based on gradient/ slope percent. It can also be used to compute shortest routeway between two points located anywhere on any given mesh with desired slope percent. {eg. blue path is shortest routeway between given points at a consistent slope gradient not exceeding 30%}

Software - Rhino + Grasshopper + c# scripting