SearXNG does, I think…any others? Looking around for other engines that aren’t US-based, though I guess DDG is still considered acceptable for LibreWolf’s default engine. Bangs are incredibly useful!
Brave Search has !bangs and an independant search index. Kagi relies heavily on it.
Can I use Brave search as default in firefox?
You can manually setup any site to be your default search in Firefox.
Andisearch admitts, among other commands, also !bangs
Andi is 100% free and anonymous, no logs, no ads, no tracking, random proxie, sandboxed results.
Kagi (paid) advertises a huge list of bangs with the option to customise them yourself.
Searxng uses bangs but you have to double them up (i.e. !!aur btop or !!ddg search).
I love how your first example was AUR.
I use arch BTW.
I started to try and use kagi a few weeks ago. It has bangs.
Kagi is giving out money to Yandex, which is Russian.
Is that one a paid service? Have heard good things about it but never tried.