That's actually actively developed, boost. It's the last of the old apps that's still maintained for lemmy. Sync still exists, but the dev is essentially gone. Eternity is a renamed version of infinity, but hasn't been updated in ages.

Summit is amazing overall, if not exactly the same vibe as the reddit apps that existed at the time of the api exodus. Connect is great too. Thunder deserves a mention, though both connect and thunder tend to be a tad less visually pleasant than summit.

Voyager is pretty much the go to ios style app.