Searx allows you to modify the default categories, engines and search language via the search query.
to set Category/engine
to set language
to add engines and categories to the currently selected categories
Abbrevations of the engines and languages are also accepted. Engine/category
modifiers are chainable and inclusive (e.g. with !it !ddg !wp qwer search in IT category and duckduckgo
and wikipedia for
See the /preferences page for the list of engines, categories and languages.