Which Lemmy apps/frontends do support thread merging/deduplication?

cross-posted from: https://feddit.org/post/27405929

Yesterday I found Interstellar which has this feature. I assume mainly because it is not only a Lemmy app, but also a PieFed one, which has this feature in the reference frontend (AFAIK).

Are there other Lemmy apps or frontends that support thread merging?