Is there a search engine that allows user blacklisting of domains?
There are certain websites with a propensity for spewing garbage that matches nearly everything I search for about a particular topic. I try my best to keep a mental blacklist of these sites, but, well, you can imagine how that goes...
Seems like this would be easy enough to do by just excluding those sites using the search engine's own syntax (it's usually something like "-site.com" or the like).
You could easily create your own OpenSearch search engine. Very little coding is required to do this, and it's supported by most major browsers.
https://developer.mozilla.org/en-US/docs/Web/OpenSearch
You can set it up so that Google can do this. It's a bit involved, but a few tutorials exist if you search for them.