OpenResty - Turning Nginx into a Full-fledged Web App Server
Oracle Tuxedo - Oracle Tuxedo is an application server for C, C++, COBOL, Java and dynamic language applications in private cloud or traditional data center environments.
Wildfly - WildFly is a flexible, lightweight application server.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
Phusion Passenger - Phusion Passenger is a multi-language (Ruby, Python, Node) web & app server which can integrate into Apache and Nginx
Mavimax EnduroX - Distributed transactions middleware, application server and Oracle Tuxedo alternative