Cewolf
Cewolf can be used inside a Servlet/JSP based web application to embed complex graphical charts of all kinds (e.g. line, pie, bar chart, plots, etc.) into a web page. Therefore it provides a full featured tag library to define all properties of the chart (colors, strokes, legend, etc.).

DbForms
DbForms enables developers to build sophisticated web-based database driven applications in very short time and with very little efforts. DbForms - applications are built in a manner conceptually similar to RAD - database building tools such as Microsoft Access (for Windows-based applications) or Sybase PowerSite (for web-based applications).

Display tag library
The display tag library is an open source suite of custom tags that provide high-level web presentation patterns which will work in an MVC model. The library provides a significant amount of functionality while still being easy to use.

EasyLDAP
EasyLDAP is JSP tag library for LDAP operations (It is formerly known LDAP JSP Tag Library v1.1 developed by Simya Consulting). EasyLDAP is released under the terms of the GNU General Public License.

Google JSP Tag Library
With the Google JSP Tag Library, developers and designers can easily incorporate Google queries, search results, cached pages and spelling suggestions into any web site or application.

Jakarta Taglibs
This project is an open-source repository for JSP custom tag libraries and associated projects, such as TagLibraryValidator classes and extensions to page-creation tools to support tag libraries.

JCE taglib
JCE taglib is a set of Open Source JSP tags and expression language EL functions (J2EE 1.4/JSP 2.0), communicating with Sun's JCE (Java Cryptographic Extensions) library to bring high-level strong encryption to your JSP applications. Classes are organized in such way that they can also be used for other non-JSP projects.

JPivot
JPivot is a JSP custom tag library that renders an OLAP table and let users perform typical OLAP navigations like slice and dice, drill down and roll up. It uses Mondrian as its OLAP Server. JPivot also supports XMLA datasource access.

JSP Survey Library
The JSP Survey Library is a tool for making web surveys, complex or simple. Though there are many other survey tools out there, many do not have the capability to do complex surveys. JSP Survey Library has the capability to do more complex surveys than any other tool.

MicroNova YUZU JSP Tag Library
MicroNova YUZU is an open-source (BSD license) EL-based JSP tag libary designed to augment JSTL (compatible with both JSP 1.2 and JSP 2.0). Features include: