JChartLib is a library for drawing beautiful charts. It supports linecharts and barcharts with colors, automatic axis numbering, and automatic styling depending on the number of values. Charts can be integrated into Java swing applications. Charts can be saved as jpg or png image files.
wxFreeChart is powerful charting library based on wxWidgets. It is designed with flexibility in mind, and supports many types of charts with many different configurations. These include line/histogram charts base on x/y coordinates, bar charts (vertical or horizontal), stacked bar charts, layered bar charts, OHLC financial charts (bars or candlesticks), pie charts, bubble charts, and Gantt charts.