Are there other curated film collections like the Criterion collection?
If by curated, you mean general releases overseen by a group: Yes. Many
If you mean in terms of overall quality for film-buffs and enthusiasts, the short is answer: No.
Longer answer: There are distribution companies like Anchor Bay, Blue Underground, and the Kino Collection (who made a great name for themselves in releasing well-received foreign releases and art-house films by such unique filmmakers as the Quay Brothers and Jan Švankmajer) as well as studio-mandated "classic-treatments" like Infinifilm, Sony Classics, Paramount Vantage (now nearly defunct), and others. While Anchor Bay and Blue Underground provide quality versions of more underground and genre films, nothing compares to the scope of the Criterion Collection and their exemplary releases with the best possible film-to-disc transfers and extras that include cast and crew. The Criterion Collection has set the bar higher than any other single distributor can match, having begun to release laserdisc widescreen editions of movies with extras (including audio commentaries) in 1984. It should be noted that the Criterion Collection has been partners with Janus Films for many of their releases.
Roskino provides a like-minded option for Russian and Soviet-era film. I'm sure there are others for many other countries.
The Turner Classic Movies library might also be considered something akin to the Criterion Collection, although your mileage may vary.