If you are tired of using Excel to create charts and graphs, then you can try these free apps listed below:

1. JFree Chart– Java chart library that makes it easy for developers to display professional quality charts in their applications
2. XML/SWF Charts– A simple, yet powerful tool to create attractive charts and graphs from XML data
3. FusionCharts Free– A flash charting component that can be used to render data-driven & animated charts for web applications and presentations
4. Timeplot– A DHTML-based widget for plotting time series and overlay time-based events over them (with the same data formats that Timeline supports)
5. Flare– An ActionScript library for creating visualizations that run in the Adobe Flash Player
6. Chronoscope– Turn tables into time machines. Embed the widget into web pages
7. JS Charts– JavaScript based chart generator that requires little or no coding, uses client-side scripting (i.e. performed by your web browser)
8. ggplot– ggplot is an implementation of the grammar of graphics in R
9. R– software language and environment for statistical computing and graphics that provides a wide variety of statistical (linear and nonlinear modelling, classical statistical tests, time-series analysis, classification, clustering, …) and graphical techniques, and is highly extensible.