I love HighCharts and use it for my open-source project at http://solarpi.tafkas.net http://solarpi.tafkas.net If you have a commercial product you have to pay

I love HighCharts and use it for my open-source project at http://solarpi.tafkas.net http://solarpi.tafkas.net If you have a commercial product you have to pay for the license though.