There exists the yacy project. As far as i understand, this is not a crawler like google, but it provides some search results.
It might be worth to incoporate ask.moe with yacy. So ask.moe would feed its results back to yacy and also use the results of yacy.
Looks interesting, I'm open to add support for fetching their results, but I wouldn't enable them on Ask.Moe since the results appear to be a bit unreliable at the moment, and a lot of the results don't return a description, e.g. https://yacy.searchlab.eu/yacysearch.html?query=sourcehut+%2Flanguage%2Fen.