Websites can have a sizable number of bots which can contribute to a large number of page views in analytics. This article provides information on mitigation of bots on the site.
Episerver does not have a documented 3rd party Bot detection tool that unequivocally can be recommended and supported. Bot Detection can be done programmatically as seen in example below:
How do I detect bots programatically
The discussion moves towards a smart Robots.txt and we have some Episerver ones available through a handler and can be integrated and used through the interface.