http://java.sun.com/products/hotjava/index.html

HotJava is a full-featured, lightweight
Web browser with a highly
customizable user interface. It is built
on the HotJava code base, which
provides a secure,
platform-independent, scalable, and
customizable base for building
Web-aware applications and suites
that are 100% Pure Java. HotJava
can download and execute applets
from behind corporate firewalls. You
can extend the browser's capability
dynamically--without increasing its
base memory footprint--by installing
new content and protocol handlers
for it to use with new media types or
protocols. Developers can also
embed browser functionality into an
existing application with the HotJava
HTML Component, a JavaBeans
component that parses and renders
HTML. The HotJava 1.1.2 release
includes the Java Runtime
Environment for the Java
Development Kit (JDK), version
1.1.4. 

Minimum requirements:
Windows 95/NT