`qless` is meant to be a performant alternative to other queueing systems, with statistics collection, a browser interface, and strong guarantees about job losses. It's written as a collection of Lua scipts that are loaded into the Redis instance to be used, and then executed by the client library. As such, it's intended to be extremely easy to port to other languages, without sacrificing performance and not requiring a lot of logic replication between clients. Keep the Lua scripts updated, and your language-specific extension will also remain up to date.

Symphony is a subscription-based asynchronous job system. It allows you to define jobs that watch for lightweight events from a distributed-messaging AMQP broker, and do work based on their payload.