author of Lucky here. Would love to hear what you don't like about Lucky's ORM (Avram). It is not quite as feature complete as ActiveRecord, but in some ways it has more features (like being able to do more advanced queries in Crystal `>`, `ILIKE`, etc.
There's also sidekiq.cr from the same person who made Sidekiq for Ruby: https://github.com/mperham/sidekiq.cr