Spooler
Send, receive, ack. A hosted queue with leases and retries and little else
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You can change a job while it sits mid-queue instead of draining and re-enqueueing, but read the licence: the server is BSL 1.1, with no commercial production grant until 2030.
A queue server that sits on neither Redis nor your database. It ships as a single native binary over an embedded LSM store: extract it, run serve, and you have durable queues with no infrastructure to provision. The API speaks HTTP/1.1 and HTTP/2 with JSON or MessagePack, holds streaming connections, and uses heartbeats to spot dead workers. Official MIT clients cover Node, Ruby, Elixir and Rust, and a top command shows the queues live. Version 0.7.3, 522 commits, by Chris of zizq-labs. The 100,000 jobs a second claim comes with no published method.
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