Gtools_Jar_Planter is a scatter-type utility that helps you "plant/paint" a list of objects across a surface. useful for adding rocks and trees to a terrain and so forth. Get it for free at www.evvisual.com, here
Guillemro has a whole lot of useful maxscripts on his site, all available for free. If you find them useful, why not show him some props and give him a donation to say thanks for his hard work?