This site hosts a number of open-source projects and associated writings, some of which are:

java-diff

An implementation of the longest common subsequences (LCS) algorithm in Java. Supports all Java types that are derived from Object (that is, not primitives).

DoctorJ

Beyond the level of what Javadoc does, DoctorJ compares documentation against code. Among what it detects:

• misspelled words
• parameter and exception names:
• • missing
  • misordered
  • misspelled
• Javadoc tags:
• • invalid
  • misordered
  • missing expected arguments
  • invalid arguments
  • missing descriptions
• undocumented classes, methods, fields, parameters

DiffJ

An application for comparing Java source code, based on code content, disregarding whitespace, comments, and reformatting.

• added, changed, and deleted type declarations (classes and interfaces)
• added, changed, and deleted methods
• added, changed, and deleted fields
• code changes

apercu

An application for extracting and summarization activity from an Apache log file. Displays users, their hosts, resources sought and stati, referrers, and hits over time.

Coloryze

An application for generating palettes of colors as RGB, based on color theory and schemes. Supports text and HTML output, samples and full spectrum generation, and limiting by saturation and brightness values.

This application is also available for execution online.

glark

Called "grep on steroids", glark supports the usage of Perl compatible regular expressions (PCRE), which should be familiar to users of Perl, PHP, Python, and Ruby. Expressions can be complex, matching across a certain number of lines.

cvsdelta

cvsdelta helps manage operations against a CVS repository, automatically adding and deleting files to CVS, as they change in the local project. It can also be used to generate metrics and statistics of the number of lines of code that have been added, changed, and deleted.

svndelta

svndelta is based on cvsdelta, yet works for Subversion instead of CVS. It provides a statistical summary of changes to a local project, and can automatically add and delete files against Subversion.

Phraze

This application generates a list of the combinations of valid English words for a phone number. An online version is also available.

Qualog

A Java library that provides extensive output for logging and debugging.