Databases & opening books are allowed. Engines and endgame tablebases aren't allowed. Not much room for questions there, such software usage is ethical, cheating is NOT ethical. 
software and online chess
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extensive and vast use of various software in online chess
poses some questins.is it really helpful to the player in sharpening
his armoury?is it ethical to apply the software in online chess?
is it helpful in the development of genuine chess?