I sympathize with the authors of Varnish and nginx; their software is used all over the place, and they want to make a living at it. I just don&#x27;t want to support that kind of business model, and I&#x27;m never dealing with per-server license compliance again.<p>I wish more companies would model themselves after Percona: charge for support, custom engineering and on-call -- don&#x27;t fork or paywall any code.<p>ATS suffers by comparison, since there is no &quot;ATS Inc.&quot; to provide support and engineering work. There&#x27;s OmniTI, but I don&#x27;t have first hand experience with their service to say if it&#x27;s worthwhile or not. They did get paid to write the current ATS docs, so presumably they know what they&#x27;re doing.<p>I wish ATS got more attention, but it is after all a bit of a niche product hidden away in the Apache Foundation with a bunch of unrelated Java projects. It&#x27;s too fiddly for small scale use, and once you hit large scale you&#x27;re pretty much hiring someone from Yahoo or elsewhere that has experience running and developing it (for example: I&#x27;d like to hire ATS people).  Doesn&#x27;t give it a lot of opportunity to trickle into smaller shops and grow with their service.