Games similar to Webtendo include Ajax Push Engine, which is free and open source. Other options are RingoJS and GameJs. In total there are three games like Webtendo for self-hosting.
APE is a full-featured OpenSource solution designed for Ajax Push. It includes a comet server and a Javascript Framework. APE allows to implement any kind of real-time data streaming to a web browser, without having to install anything on the client-side.
Ringo is a multi-threaded JavaScript platform built on the JVM and optimized for server-side applications. It takes a non-dogmatic stance on things like I/O paradigms. Ringo ships with a large set of built-in modules and follows the CommonJS standard.
