The image above shows the 3 types of blade available for cutting timber. A crosscut saw is designed for cutting across the grain of the timber, will be OK on slant cuts and will struggle with rip cuts. A ripsaw is great for cutting with the grain, but very poor in the other directions. Universal blades are designed to cope with all 3 types of cut, but do not do quite as well as the specialist blades.
Z-Saw make several rip saws, as follows:
Last, but by no means least, comes the traditional Japanese double-edged saw. The S-250 double-edged shown below has crosscut teeth on one edge and rip cut on the other edge. Extremely useful, but care clearly needs to be taken as there is always a naked blade facing upwards.
All the rip saws have graduated teeth, smaller at the handle end for starting a cut and gradually increasing in size along the blade.