Tozzl is a chat platform that allows you to quickly create private, password-protected message boards as well as public boards. To get started visit Tozzl and select "create a new Tozzl." Then you can name your message board and set a privacy password (optional). Tozzl assigns a new, unique URL to each message board. On your message board you can add sections for chat, file sharing, to-do lists, and YouTube videos. You can also import the feed of a Twitter hashtag into your Tozzl boards.
This is a service that provides exactly what its name implies. On Backchannel Chat you can create a free backchannel room (AKA chat room) in which you can post comments and questions for your students to respond to. Your students can respond in realtime. Students can ask you and their classmates questions within the confines of your Backchannel Chat room. The free version of Backchannel Chat limits you to 30 participants at a time.
GoSoapBox allows you to have your audience respond to questions through their laptops, tablets, and phones. Polls and Discussion in GoSoapBox are the meat and potatoes of the service. The Polls tool allows you to survey your audience by having them select an answer choice in response to a question. The Discussions tool allows you to have audience members reply to open-ended questions. One of the simplest yet effective survey options in GoSoapBox is a tools called a Confusion Meter. The Confusion Meter allows members of your audience to simply say, "yes, I get it" or "no, I don't get it." The Confusion Meter, like all of the GoSoapBox survey tools, can accept anonymous feedback. You can use the Social Q&A tool in GoSoapBox to have students submit their questions to you. Students can see each other's question submissions and vote them up if they want to.