Quercus is not dependent on Resin (Open Source or Commercial), and it is open source.
We run Quercus on Jetty and Tomcat, and in most of the applications we use, it is at least 2 times faster than mod_php, not to mention all the security benefits of applications on the JVM.
Commercial resin is indeed even faster, but since most of our customers did not want to buy an additional license, Tomcat is good enough for most of them. It’s very convenient for us, since we don’t need to use Apache HTTPD before Tomcat, so the maintenance costs are quite low.
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