Java application for calculating really BIG numbers. [Open Source, GPL]

Library and command-line/GUI utility to compress and decompress BZip (.BZ2) format files. [Open Source, GPL]

Port of Diff, a program to print out differences between files, to Java. [Open Source, GPL]

Allows merging, stamping, appending, form filling and page placing, rotating, scaling and adding new content to existing PDF documents. [Shareware]

Allows a user to monitor several log files concurrently. [Open Source, GPL]

Small utilities and libraries such as: cascading proxy server, photo album applet, .class file editor, WAN simulator, and auto-adjusting JLabel. [Open Source, GPL]

A simple Java application which allows a user to search all files in a directory structure for lines matching a given pattern. Its functionality is like a combination of the Unix 'find' and 'grep' utilities, but with more features. [Open source, GPL]

Official port of GNU Tar, handles .tar files. Only has basic functionality but does extract selected files, and does have a GUI. [Open Source, GPL]

Small Java utility to remove unnecessary space from HTML files, resulting in faster page downloads. [Open Source, Artistic License]

A checksum utility entirely written in Java (JAva ChecKSUM). It supports most common checksum algorithms (Adler32, BSD sum, POSIX cksum, CRC-16, CRC-32, MD2, MD5, SHA and Unix System V sum). [Open source, GPL]

Searches through archive files for class files. [Freeware]

Allows read only access into a Java archive. This read only access allows the inspection of all of the classes and interfaces contained in the archive. [Open source, GPL]

A powerful Java Console Client written 100% in java. Mainly written for System Administrators, Coders and also written with the intention to be plugged into various other applications.

Tar archive handler creates, lists, and extracts TAR files. Supports gzipped tar files. Can be invoked either using its Java API, or from the command line, or from a GUI version. [Open Source, GPL]

Simple program for calculating time intervals; can be particularly useful to pack audio tracks on magnetic tapes or disks. Can be run as applet or application. [Open Source, GPL]

Free java utilities with source code. Includes powerful ClassEditor that lets you manipilate compiled java binaries. [Open Source, GPL]

A command-line utility for reporting the differences between ASCII or binary files, or recursively finding the differences between two directories. [Freeware]

Java programs for creating client-side image maps (both HTML-based and applet-based). [Freeware, source available]

A scheduler written in Java. Reads and stores the tasks to execute in a file, a data base or an EJB and provides a web basic UI. [Open source, LGPL]

Translates words and phrases from one language to another. Includes pluggable dictionaries and lexicons. [LGPL]

Includes jDiskReport, a free cross-platform graphical disks report utility. [Freeware]

GUI report designer. [Open Source]

A strong password generator for secure login protection. [Open source, GPL]

JSP isn't just for the server - it can also be used as a platform-independent report description language. JSPExecutor is a command-line tool that executes JSPs. [Open Source, GPL]

GUI-based Task Scheduler for Java classes. [Free for non-commercial]

A Java port of HTML Tidy, a HTML syntax checker and pretty printer. Like its non-Java cousin, JTidy can be used as a tool for cleaning up malformed and faulty HTML. In addition, JTidy provides a DOM interface to the document that is being processed, which effectively makes you able to use JTidy as a DOM parser for real-world HTML.

Java 2 Application for converting numbers (radixes, phys. units, roman numbers, spoken numbers, exchange rates). [Open Source, GPL]