Pax Web

Jetty: Java based HTTP/1.x, HTTP/2, Servlet, WebSocket Server   (Compare Project)

Mostly written in Java

License: eclipse

Wicket Stuff   (Compare Project)

Mostly written in JavaScript

License: apache_2, BSD-3-Clause, lgpl

Arquillian   (Compare Project)

Mostly written in Java

License: apache_2

Winstone Servlet Container   (Compare Project)

Mostly written in Java

License: common_development_and_distribution, lgpl

Restlet Framework   (Compare Project)

Mostly written in Java

License: apache_2, common_development_and_distribution, eclipse, lgpl3, lgpl

Yurconf   (Compare Project)

Mostly written in Java

License: Unknown

Netty Project   (Compare Project)

License: apache_2

Net4j   (Compare Project)

Mostly written in Java

License: eclipse

Atmosphere   (Compare Project)

Mostly written in Java

License: apache_2, common_development_and_distribution

ironore server   (Compare Project)

License: lgpl