The "latest" in the welcome addition of student response systems and well deserves its place at the top table with Kahoot and Socrative.
Can be used in many modes such as interactive, "real time" answering with students. Teacher asks question or puts question on board and students reply with a response. I particularly like the Draw Response option where you can draw a reply (great with tablets). http://snapguide.com/guides/run-quick-assessments-on-infuselearning/ shows you more
I have used Infuse mainly in Assessment mode by writing a series of questions and sending out the link and ID to students (bit like Kahoot but not real time). GREAT range of questions from multiple choice, multiple select, sort in order, Likert and free text. You can also add in images.
As with Socrative you can creates pupil classes and data sent back to you can be downloaded as a spreadsheet.