The best alternatives to Tertill are iRobot, SpinX, and The Wall Garden. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurree— The smarter, simpler way to analyze your data
iRobot Corporation is an American advanced technology company founded in 1990 by three members of MIT's Artificial Intelligence Lab who designed robots for space exploration and military defense.
The Roomba® i7+ Robot Vacuum with Clean Base™ Automatic Dirt Disposal takes convenience to a new level — automatically emptying into an enclosed bag that holds 30 robot bins