"Cacoo is a user friendly online drawing tool that allows you to create a variety of diagrams such as site maps, wire frames, UML and network charts.
Cacoo can be used free of charge."
Now you can turn to these tools found on the Internet that will help you with tasks such as note-taking, bookmarking websites, highlighting important text during online research, creating mind maps, tracking time, keeping up with appointments, collaborating with others, managing projects, and much more.
Games for grades k-6.
"We've thoroughly searched the web for engaging and educational games for kids, and we've collaborated with top educators to ensure that all of our games are age-appropriate, relevant and compliant with academic standards. Our team of educators has also created a vast library of "Homework Help" as an additional resource for students, teachers and parents."
Site lets teachers post a question online. Students then respond via webcam (no account required) and have their (moderated) comment added to a really great-looking video wall online. Site does cost $65 annually, but that includes 10 walls and virtually endless questions/responses.
Nice brainstorming/concept mapping tool with lots of features, even in free version. Includes several templates, ability to include images, stamps, links, maps, more.
Free learning management system with good collection of resources, including discussion threads, assignment sharing/grading, messaging tools, flashcards, color-coded subjects/classes, more.