Navid Benders There's no paywall here. All the pieces mentioned in this article-- php-node , the php stackable , and the Watt application server --are all open source and Apache 2.0 licensed. And yes, I contributed back as soon as I was able. We do HAVE paid products, but none are covered in this article--this is all free stuff. We obviously need to have SOME paid products though, or how could we pay for the time to build things like this?