Google Groups
Triggers: !gg, !ggroups, !гг
Try it
Kagi would openhttps://groups.google.com/groups/search?q=weather+tomorrow&qt_s=Search+Groups
Run @gg in Kagi for Kagi's own results from groups.google.com only
URL pattern: https://groups.google.com/groups/search?q=query&qt_s=Search+Groups
Searches groups.google.com, filed under Google.