- Bloki
 - Provides a web-based authoring tool that allows users to create, annotate, and collaborate on shared web documents. - Cunningham, Ward@
- Instiki
- Wiki clone with a focus on simplified installation. Other features include exporting options and multiple markup choices.
- Jotspot
- Makers of wiki technology that lets users collaborate and build upon shared documents.
- MediaWiki
- Free server-based software, licensed under the GNU General Public License (GPL) and designed to be run on a large server farm for a website that gets millions of hits per day.
- OpenStreetMap
- Free editable map of the whole world.
- PmWiki
- WikiWikiWeb system based in PHP featuring RSS feeds, simultaneous editing, calendar options, and other options.
- TiddlyWiki
- Local wiki client designed for managing small items of content.
- TWiki
- Web-based collaboration platform for running a project development space, a document management system, a knowledge base, or any other groupware tool.
- Wetpaint
- A selection of free and easy tools for creating wiki web sites.
- Wikicities
- Offers users free wiki hosting to build a community-created website.
- Wikipedia: WikiWiki
- Offers a definition of the term and a short history of wiki software.
- WikiTree
- The goal of WikiTree is to construct bloodline trees of families that will gradually start forming a global family forest of humanity. All entries are freely edited by users.
- WikkiTikkiTavi
- Wiki script that includes site search, versioning, page and site-wide lockdown features, and more.
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