There are two ways to deploy your WebObjects Application, "Standard" and "Servlet". They have different components and configurations, but they all take your Application as a .woa bundle.
This is how a great majority of WebObjects applications are deployed. This is the type of deployment for which there is the most documentation and support. It requires four distinct pieces of software to be installed to support your application:
Usually, people run wotaskd, JavaMonitor, their applications and the Web server on the same server, but it's also possible to run each part on different servers, or to have multiple servers filling each role if needed.
Andrew Lindesay has written an open-source AJP adaptor for WebObjects 5 which should allow you to deploy your WebObjects application without servlets or the 'wotaskd' infrastructure. Such a deployment is most easily achieved with versions of the Apache HTTP server 2.2 or better as they have built-in support for load-balancing and AJP request-forwarding.
This adaptor is distributed under the LEWOStuff open-source framework. It is however stand-alone and has no direct dependency on other libraries or frameworks other than obviously WO 5. For more details on this, see the relevant section of the PDF overview supplied with the LEWOStuff framework.
All three of these Application Servers / Deployment Styles can run on any platform that supports Java 1.5 or later. The ones that there is documentation for are:
You can learn more about deployment by listening to the Practical Deployment session from WOWODC 2009, available from the podcast page on wocommunity.org.
wotaskd and JavaMonitor were released by Apple to the community as open source when WebObjects 5.4 was released in 2007. They were added to Wonder and improvements and bug fixes were made to the tools. We strongly suggest that you use the Wonder Versions.