Welcome to the Web is a series of lessons for teaching young students how to navigate the Internet. There are seven lessons in the series although the first lesson is really just an introduction to the site. The other lessons in the series teach kids the basic vocabulary of the web, online safety, and search techniques. The series concludes with a challenge exercise in which students test their new knowledge and skills. Every lesson in the series comes with an optional worksheet in PDF form.
LMK Life Online is a website created for the purpose of educating girls about online safety. LMK Life Online is sponsored by the Girl Scouts and Microsoft. On the site girls can learn through articles and videos about protecting themselves from online predators. Girls will also find lessons about cyberbullying and online privacy. After reading the articles and watching the videos, girls can test their knowledge through interactive quizzes.
The Google Family Safety Centerintroduces parents to and shows them how to use Google's safety tools including safe search, safe search lock, and YouTube's safety mode. Google has partnered with a number of child safety organisations to develop educational materials for dealing with topics like cyberbullying, strangers online, protecting personal information, and avoiding malware online. Finally, Google's Family Safety Center contains a collection of videos featuring Google employees sharing the strategies they use with their own kids for teaching online behavior and keeping their kids safe online.
The Virginia Department of Education has produced an engaging and useful site for teaching students web safety lessons. Internet Safety With Professor Garfield currently offers an animated lesson on cyberbullying and an animated lesson about online safety. As you might guess from the site's title, the lessons feature Garfield. Both lessons use the same model in which students watch a cartoon, take an informal quiz, then try to apply their new knowledge to a few different scenarios.
A Thin Line is a digital safety education resource produced by MTV in collaboration with other media partners. The purpose of the site is to educate teenagers and young adults about the possible repercussions of their digital activities. A Thin Line offers a series of fact sheets about topics like sexting, digital spying, and excessive text messaging and instant messaging. A Thin Line gives students advice on how to recognise those behaviours, the dangers of those behaviours, and how to protect your digital identity. Students can also take a short quiz to practice identifying risky digital behaviors.
TumbleBookLibrary is an online collection of animated, talking picture books which teach young children the joys of reading in a format they'll love.
This list cannot begin without mentioning Moodle first. Moodle is an free platform that is commonly referred to as a course management system or virtual learning environment. To use Moodle you have to either install it on your own server(s) or have someone host it for you. If you don't have a server of your own, a quick Google search for "Moodle hosting" will lead you to plenty of companies that will host Moodle for you.
Claroline is an open source program that gives users the freedom to create their own online classroom. Using Claroline teachers can produce assessment activities, post and collect assignments, build a wiki, monitor student activities, and create chat rooms or discussion forums. Claroline is available as a free download for Mac, Windows, and Linux systems. Claroline is not a hosted service so you do need to have someone host your installation of Claroline.
Udemy is a new free platform for teaching courses online. Anyone can sign-up for Udemy and start creating courses in minutes. Udemyoffers a variety of tools for delivering content online. Course creators can publish slideshows, publish videos, and create mash-ups of slideshows and videos synched together. Course creators can also hold live online sessions through Udemy's virtual classroom platform. 
RCampus is a free, web-based, platform for creating and conducting courses online. UsingRCampus teachers can create a course, collect students' assignments, and maintain a markbook. RCampus provides all of the tools you would expect to find in an online course management system. ThroughRCampus you can post assignments, host discussion forums, post videos, post images, post links, collect assignments, and manage a markbook. 
Weebly is a very intuitive and feature rich platform for creating a free website. For those reasons, it's always on my list of recommendations to teachers who want to build a classroom website.
School Rack offers a free service for teachers to build and host their own classroom websites. Unlike other free website solutions that are targeted toward a general audience, School Rack has features designed specifically for teachers. For example, on your School Rack website you can post assignments with full descriptions, expectations, and deadlines. This is an integrated feature, not an add-on page that you have to create yourself. School Rack offers students and parents free accounts to communicate with teachers. Once your students and parents have activated their accounts, you can directly message individuals or send messages to groups that you have created.
Kafafa offers a wide array of ad-free templates that you can use to build your free website. Once you've selected a template, editing the content of your website is easy to do. To edit the text appearing on your site's pages simply select the text box and start typing. To add or edit other elements of your site's pages just click edit and add images, videos, and hyperlinked text using the simple editor. If you can send an email, you can create a website with Kafafa.
An outstanding aspect of Yola is that not only is your website free, it remains free regardless of how much content you add to it. This is a good thing if you plan to post a lot of audio or video content as some website builders and hosts begin to charge once you reach a certain volume content. Yola provides good tutorials and forums for first time users. 
Lifeyo is a free service for creating great-looking websites and blogs. It takes less than a minute to create your new website with Lifeyo. To get started just enter a title for your site, pick a design template, and create an account by entering your email address. All of Lifeyo's clean, simple, and good-looking templates allow you to include a blog element within your website. Integrating a blog within the site is a great option for those people who are just getting started online and aren't yet sure how they're going to use their blogs or websites. Lifeyo supports adding multiple authors to your site.
Webs has all of the characteristics that you would expect to find in a free website platform. Websites built using Webs can include videos, calendars, polls, and a wide variety of third party widgets. Webs offers a wide variety templates and layouts to select from. For people with a higher level of comfort with technology, Webs might be a little too basic for your needs. In that case you may want to consider Snap Pages.
Snap Pages provides a free service as well as a premium service for creating your custom website. The free service has more than enough features for a teacher to set up and maintain a class website. The editing and customising options of Snap Pages allow users to create pages that are little more clean and professional looking than some of the other companies in this market. The image resizing tool reminds me of the one found in Apple's Keynote presentation software. 
Web Node is a simple way to build a website. The easy to use, drag and drop, interface makes it easy to change the look and feel of your website. For two reasonsWeb Node is a good tool for students to use to present and share their work with a wider audience. First, Web Node does not put any advertising on your website. And second, the user interface is intuitive enough for first-time users to navigate on their own. 
What makes Jimdo such a good option is the wide array of templates, layouts, background options, and editing options. On many free website builders once you pick a template or design you're locked into all of the pre-defined parameters of that template unless you know HTML and CSS. Jimdo is different because it allows you to tweak the predefined templates and designs. Aside from the design options, Jimdo has some other integrated elements worth mentioning. Jimdo offers you the option to create a blog as an element of your website. You can also take advantage of email management options within Jimdo.