So far I've mostly used Celery in Python, but at jobs past there was also Sidekiq (granted, the use cases for that were a bit different, but it's kind of in the same bucket).

Haven't had the opportunity to work with them, but I've heard good things about SQS and other cloud queues, but I think those are fundamentally message queues, so you'd be responsible for writing a job queue layer over it, which can be a huge hassle.