https://adnauseam.io - clicking ads, so you don't have to.

I used this for a while. Funny how it even has a "damage meter" estimating how many $ of ads I've clicked on the page. At some point Google started occasionally giving me captchas just when I searched stuff, saying they detected unusual behavior.

Is it open source?

Yes https://github.com/dhowe/AdNauseam and it's a fork of the open-source uBlock Origin.