HighCharts is a JavaScript-based chart library with stylish graphs, excellent support, and impressive compatibility. You can count on their charts to function in every browser from the dreaded Internet Explorer 6 to the latest version of mobile Safari in iOS devices. Their charts also have subtle animations — the growing of bar graphs and the tracing of trend lines — that add to their visual appeal. The library is open-source, so the charts can be modified for the unique needs of any project. For non-commercial use, HighCharts is free, but for commercial projects it has a significant cost. For a single website, using HighCharts will only cost $80, but for a team of 10 developers to use the library in multiple projects, the price jumps to $2,000. If you employ HighCharts in an application, you’ll have to contact the makers to negotiate a deal in terms of the price and use of HighCharts.