Irrlicht Engine

I searched for any answers.

(dates back to 2012)

Here
viewtopic.php?p=260758&hilit=Bot+bots#p260758

Here
viewtopic.php?t=47416&hilit=Bot+bots

Are they good bots or bad bots?

Those should be web crawlers. Good as in - they allow you to search for forum stuff via search-engines. Could be they are part of the reason the forum is often so slow, not sure (I suspect this has more to do with sourceforge servers and/or spam attacks).