WordPress is Open Source blogging software that runs on PHP and MySQL. WordPress has an active support community that provides guides, themes, plug-ins and other resources.
Blogger.com is a hosted blogging service powered by Google. Users can quickly create accounts and begin blogging using a clean, easily navigable interface.
LiveJournal allows users to quickly create an online space centered around a private journal, a blog, a discussion forum or a social network
b2evolution is an Open Source blogging engine that runs on PHP/MySQL, and offers file and photo management, advanced skinning, multiple blogs support as well as detailed user permissions.
WeblogMatrix is an ever-expanding comparison area for weblog software and hosting sites. As there are more software options than can be listed on this page, CALPER recommends this site as a good springboard for learning about the many, many weblog programs available.
MediaWiki is a Open Source Wiki engine that was created originally to power Wikipedia. Supports multilingual use.
UniWakka is a light-weight, easy to use Unicode-based Wiki that can be configured to run on nearly all servers.
WikiPatterns is a hosted Wiki service that allows users to quickly create up and being using Wiki spaces.
SocialText is a Wiki hosting service with an emphasis on supporting professional collaboration.
PBWiki is a Wiki hosting service that provides allows users to create "free" (advertising supported) Wikis or choose to upgrade to a paid professional account with no advertising.
Unicode.org. Learn more about the Unicode standard and applying Unicode to your database and programming initiatives.
Alan Wood’s Unicode Resources. A comprehensive resource for developing web-applications around the Unicode standard.
Croquet Consortium. "Croquet is a powerful open source software development environment for use in creating and deploying deeply collaborative multi-user online applications and virtual worlds on and across multiple operating systems and devices."
World of Warcraft is the most populated MMORPG (Massively Multiplayer Online Role-Playing Game) set in the fantasy world of Azeroth.
Second Life is an online 3D world where users interact via customizable avatars. Many "real world" organizations and institutions have a presence in Second Life.
Virtual Environments provides an expanding comparison of available software based on platform and many categorical descriptors.
Moodle is a comprehensive Course-Management System (CMS)featuring integrated blogs, wikis and discussion forums, as well as calendar-based events, grade management and self-registration for students.
Whiteboard is a full-featured CMS emphasizing use in colleges and universities, featuring cross-semester tracking, grade management and discussion boards.
Sakai Sakai (formerly CourseWork) is an Open Source CMS project supporting teaching and learning, ad hoc group collaboration, support for portfolios and research collaboration.
Facebook is a social networking site where users interconnect with friends, share interests, photos and keep in touch.
MySpace is a social networking site offering an interactive, user-submitted network of friends, personal profiles, blogs, groups, photos, music and videos for teenagers and adults internationally.
Flickr is a social photo and video sharing site built atop an online community platform.
del.icio.us is a social bookmarking site where users store and manage their browser bookmarks, allowing the service to recommend sites based on a comparison with other users' bookmarks.
YouTube is an open video sharing service viewable by both community members and anonymous visitors. Members can comment on videos, develop profiles and cross-link videos.
Google Docs is an online document sharing platform allowing users to manage their documents from any web-browser, share these documents, and invite collaboration from other users.
CiteULike is a social citation site where users manage their academic citation lists, allowing the site to compare lists and make suggestions based on these comparisons.
IMEEM is a social media sharing site centered around video and music. In addition to sharing media, media playlists are stored and compared and new media recommendations are provided.