What are your favorite searxng customizations / bangs?

Nothing hugely advanced. I added the NixOS wiki to !software_wikis and I also redirect the old wiki to the new wiki (since the former blocks VPNs). I also use the redirect functionality to redirect twitter/reddit etc links to FOSS frontends.

I’ve also added a bunch of stackexchange sites with their own keywords.

I’ll add you can also use duckduckgo bangs by using !! e.g. !!protondb.