C Server Pages - An application server that supports building web applications using C++ and templates with dynamics elements embedded. Supports Linux. By T. Gonzalez.

Helma - A Java based application server which is using ECMA-Script as its scripting language. [Open source, BSD style license]

NGASI Application Server - Turnkey Next Generation Application Server solution for Web and Wireless Application Hosting and enterprise environments such as ISPs and IT Departments.

SQLData Enterprise Server - A web application server that combines web services and database services together. It provides session management, multi-level authentication, data encryption, load distribution and custom logics. By SQLData Systems, Inc.

UserLand Frontier - Frontier is a full featured application server that connects to XML-RPC and SOAP services. It includes an object database, multithreaded runtime, a content management system, and a bundled http server. It costs $899.

WebCollage Syndicator - Enables businesses to syndicate complete, interactive Web applications and services to partner sites, allowing new forms of Web partnerships. By WebCollage, Inc.

WebHub - An application server that is designed for integration with applications developed in Inprise Delphi. By HREF Tools Corp.

WebObjects - Tool for web application development and deployment. Currently available on *nix, WinNT, and Mac OS X. By Apple Computers, Inc.