A professional wiki, written in J2EE, with enterprise features such as PDF export, page refactorings, tight email integration, RSS feeds, a full remote API in addition to all the normal wiki features.

JSP-based wiki with optional versioning, licensed under GPL.

A simple and flexible wiki engine written in Java and created according to the principles of Agile Software Development. Its main purpose is to provide solutions for Agile Software Development teams.

SnipSnap is a clone of Vanilla written in Java; includes weblog functionality.

A deliberately lightweight JSP-based implementation.

An open-source Java wiki engine with a range of advanced features such as database storage, version control, attachments, text and sql search, web application developement and API.