Use OSbot at your own risk, as you would do with any other bots, but it has a good reputation, as far as I know and its owner is a member of sythe.org.
Really one of the best of safest bots is: SytheLib
SytheLib is harder to setup and its public script repository cannot be compared with major bot platforms, but if you are looking to get into botting, it's worth giving it a look.