All resources on this site are free to use, I have included Autograph (for graphing, geometry, statistics and probability) here as although it is paid-for software, Autograph viewer and many excellent resources available on line are completely free to use and do not require the Autograph software to be installed.
Craig Barton has provided many online activities which can be used with Autograph Viewer.
Try Craig’s Normal Distribution Distribution calculator for example (instructions on how to download Autograph viewer are provided with each activity). Or perhaps have a look at this Box & Whisker Diagrams actvity
Kangaroo Maths Autograph Resources Index (Alan Cately)