Servlets can solve many of the problems associated with CGI and proprietary server APIs. This article describes the overall servlet architecture and how to develop applications with servlets.

Archives of Sun Microsystem's servlet-interest mailing list.

Enhydra XMLC is a presentation engine that enforces a strict separation of markup and logic.

Access to Java Servlet 2.3 and JavaServer Pages 1.2 specifications.

Cactus is a testing framework that allows you to create unit tests for your servlets.

Official Documentation and Reference Implementation

Resource center for servlet development, including articles and free servlet downloads.

Collection of servlets to handle file uploads, send email, cache responses, generate server push pages, parse parameters, and negotiate locales for internationalization.

Java-Servlet web host supporting v2.3 and v2.4 servlet specification.

Offers servlet software, mailing lists, servlet-capable ISP list, engines, tools, articles, and examples, from Jason Hunter, author of "Java Servlet Programming" (O'Reilly).