zJSP
- Translates Java Server Pages into Java Servlets. [Open Source, GPL]
- http://www.zachary.com/s/zjsp

CQ JSP Debugger
- Allows remote debugging inside a number servlet-engine. Zero installation. JSP linemapping. [Freeware]
- http://www.day.com/site/en/index/products/content-centric_applications/overview/communique_ide/jsp_debugger.html

uitags Project
- An JSP custom-tag library that makes developing friendly UI (user interface) effortless. [Open source, Apache License]
- http://uitags.sourceforge.net/

WebCharts3D for Java
- A general purpose and specialized 2- and 3-dimensional charts as applets or interactive server-generated images (PNG, GIF, JEG, SWF, SVG, PDF, TIF, WBMP) to web browsers and mobile devices, or embed charts into stand-alone Swing applications.
- http://www.gpoint.com/

Jsp Documentation Project
- Open Source software providing a documentation standard for JSP
- http://jspdoc.sourceforge.net/