Recently found https://catalog.catodon.rocks/ Imo it's better than Lemmyverse because I need to do just one search, instead of one per software in the same conditions. Also on Fennec it doesn't seem very responsive in the UI for confirming searches, but adding ?q= to the end of the link then what's to be searched, and loading the resulting link, seems to circumvent well enough the issue. Like with https://catalog.catodon.rocks/?q=horse for finding horse-related communities.