The internet provides many free online wikis, web hosting sites and other collaborative tools. These tools are in various states of maturity. Some offer good support; others are 'as-is'.

Wikis and Collaboration Tools

Name and Description	More Information
21Classes: Create a virtual classroom and BlogPortal.	Instant use, hosted and free blogs.
Blogger: A free, easy-to-use blogging tool.	Blogs can be integrated into your class to promote student reflection, exchange of ideas and/or demonstration of key concepts.
CollegeBrain: Enables course instructors to consolidate, view, and manage their course administration at one source with a free, easy-to-use service	Adhere to 508 Accessibility and are DMCA, FERPA, and Safe Harbor Standards compliant.Privacy is protected and no ads.
del.ici.ous :A social bookmarks manager. Using bookmarklets, you can add bookmarks to your list and categorize them.	The primary use of del.icio.us is to store your bookmarks online, which allows you to access the same bookmarks from any computer and add bookmarks from anywhere. Sharing bookmarked sites is supported. See an intro about social bookmarking
Diigo: A browser add-on that can improve research productivity. Instead of just bookmarking, you can highlight portions of web pages that are of particular interest to you.	Diigo highlights and sticky notes are persistent in the sense that whenever you return to the original web page, you will see your highlights and sticky notes superimposed on the original page. See a video intro to diigo
Ekiga (formely known as GnomeMeeting). An open source VoIP and video conferencing application for GNOME.	Pure open source working alternative to Skype.
Elgg : An open source application for rolling out a social network. It provides all the components of a social networking site	Elgg allows you to take full advantage of the power of social technology with elegant, flexible solutions for organisations, groups and individuals.
FeedDemon: A popular Windows RSS reader.	Not wild about Windoz, but a good feed reader.
Fliggo: Create your own video site.	Build a video blog, the next YouTube or just a private place to share videos. With Fliggo, you can control who can join, upload, comment, or put a password on your entire site.
gliffy - Turn your ideas into pictures. Online, web based shapes drawing tool	Basic's shape libraries lets you create and share diagrams.
HotChalk - A learning environment for K-12 teachers, students and parents that includes a learning management system (LMS), a rich library of teacher-contributed lesson plans, premium digital content like NBC News video, and professional development for teachers in a Web-based environment.	Available through any Internet browser, the HotChalk Learning Environment is an easy to use system and brings teachers, students and parents together to improve education.
JumpBox Wikis: Jumpbox offers five different virtualized 'wikis in a box'	Take your pick from Enterprise wiki, PmWiki, DokuWiki, TikiWiki or MediaWiki. Each is available as adrop in virtualized machine.
MediaFire: A free file hosting service for businesses, professionals, and individuals to share files and images with others	File hosting, file sharing made easy. Read More
Moodle - Course management system. Create your own or perhaps starts with the Moodle Jumpbox	Allows educators to create quality online courses.
Sage: Firefox RSS plugin. Makes followingnews feeds easy	Follow RSS feeds in a Firefox browser side panel. See RSS HowTo for details.
Sakai : An online Collaboration and Learning Environment. Many users of Sakai deploy it to support teaching and learning, ad hoc group collaboration, support for portfolios and research collaboration.	Sakai is a free and open source product that is built and maintained by the Sakai community. Java based
Scribd: Store documents - doc, ppt, pdf, xls, etc and share them with others. You can also embed a document in your blog or web page.	Think of scribd as youtube foe documents. Not well organized, but a great repository. Supports groups
SiteBar is a Web browser bookmark synchronization solution.One feature that sets SiteBar apart from many others is the ability to set up your own bookmark server, which keeps the whole system under your control.While SiteBar is useful for individuals, it is even more useful for corporate or other groups	You can also use SiteBar through a third-party server that offers membership levels ranging from a free, ad-supported "basic" level up to an "admin" level that costs 9.99 Euros (about $15.50) per month. While SiteBar is useful for individuals, it is even more useful for corporate or other groups
Sketchcast: A free, web-basedonline white board. Recorddrawings, diagrams or writing on the digital white board. Overdub with audio	Sketchcastprovides you with a url thatplugs into Blackboard.
Skype : Allows users to make telephone calls over the internet to other Skype users free of charge, or to landlines and cell phones for a fee.	Provides free Skype to Skype calls and supports conferencing calls for up to 10 participants.
SlideShare: The world's largest community for sharing presentations on the web.	Share presentation decks for free. Beta open. Slick features
SlideRocket: An impressive set of tools for creating, distributing, sharing and collaborating on presentations	Beta open. Very slick features. Create and share presentations, slides and other content. Take the online tour and then grab your free beta account
TalkAndWrite Whiteboard for Skype Done by Mathematician for on-line Math tutoring. Skype Certified.	Watch the video “First use”
TiddlyWiki: A complete wiki in a single HTML file. It contains the entire text of the wiki, and all the JavaScript, CSS and HTML goodness to be able to display it, and let you edit it or search it. Without needing a server.	TiddlyWiki is published under an OpenSourceLicense and maintained by a busy Community of independent developers.
TinyRSS: Internet Explorer RSS plugin. Makes followingnews feeds easy	Follow RSS feeds in an IE browser side panel. SeeRSS HowTo for details.
TokBox: Tokbox is a free service that lets you talk with your friends over live video.	Video chat and video message with friends and family for free. All you need is a webcam and a browser.
VNC: RealVNC provides remote control software which lets you see and interact with desktop applications across any network.	A graphical desktop sharing system transmits the keyboard and mouse events from one computer to another, relaying the graphical screen updates over a network. Supports virtual sharing.
VoiceThread:A VoiceThread is an online media album that can hold essentially any type of media (images, documents and videos) and allows people to make comments in 5 different ways	Watch and listen to an intro tovoicethread
ed.VoiceThread:A web-based collaborative network that is simple, powerful and safe. This community is specifically designed for K-12 educators and students. This is a secure site designed for K-12 students and teachers.	Watch and listen to an intro to the educationvoicethread How to obtain access to ed.voicethread
xvdicap: A small tool to capture things going on on an X-Windows display	Xvidcap is a tool that can capture movement on an X11 display. It works in two distinct modes: It can capture to single frames (like a number of jpeg images) or it can encode the captured frames to a video on-line. See How to Install xvidcap on Ubuntu
WeblogMatrix: A portal designed to help you decide which weblog is the best for your needs.	Compare the features of all those weblog tools you heard of. You can compare, choose and discuss the various Weblogs and their features.
Weebly: A free web hosting site. Create your own website.	Simple to use. Fairly sizable content.
Wetpaint :Free wiki websites available to anyone and easy to use. Wetpaint hosts Wikis In Education - a portal to wetpaint wikis with an education focus	Simple, easy to learn, easy to use wiki. This wiki is powered by wetpaint.
Wikispaces: A free wiki for K-12 educators	Exclusively for K-12 educational use. K-12 means kindergarten through secondary school. It is available worldwide to teachers, students, and educators.
Wordpress is a state-of-the-art publishing platform with a focus on aesthetics, web standards, and usability.WordPress is completely customizable and can be used for almost anything.You can also use the Wordpress Jumpbox (virtualized blog	There is also a service called WordPress.com which lets you get started with a new and free WordPress-based blog in seconds, but varies in several ways and is less flexible than the WordPress you download and install yourself.
Zoho - Zoho is a suite of web services offered by AdventNet.	The different web services can be accessed with just a browser & an internet connection.