Plot.ly is a free to educational (public) user web-based graphic tool that combined leading edge visualisations with a user-friendly, guided creation experience. Accepting data in a variety of forms, it leads the user through creation and sharing and then facilitates discussion around the output objects. The data, the code and any algorithm transformations are freely accessible to all users and products are easily embedded in other documents for presentation purposes.

Plot.ly also offer their services on a paid basis to enterprise users.

plotly.js is a freely available javascript framework open for developers.