I was referred to Groupworld via an online Math Coaching group I am part of, and I think I got a discounted price because of that. I paid $240 for a year's subscription. I don't know what the regular price would be. And the students don't download anything. They just click on the link I send to them and it takes them into the classroom online. They do need a computer with a camera and speakers built in. As well, though not 100% essential to working together, if the students have a tablet to use with their computers, that allows them to write on the board from their end. I have a tablet on my end, so if the student doesn't have one, I do all the writing. I just have them tell me what they would want to write, and we go from there. All of my students have told me that their experience with me online feels almost exactly the same as having me sit beside them in person.