SearX and Searxng are the most common options, but instances often get blocked by the engines they use. Users need to switch between instances quite often. eTo

SearX and Searxng are the most common options, but instances often get blocked by the engines they use. Users need to switch between instances quite often. eTools.ch uses commercial APIs so it doesn't get blocked, but it might block you instead (very sensitive bot detection). Dogpile is one of the older metasearch engines, but I think it only uses Bing- and Google-powered engines.