Thank you Sophia, Allison and Hayat for your posts about the various data visualization tool that are available and you have found useful. I’m sure that the most frequent tool in use today is Microsoft Excel.
Please check out this PDF file that lists many Data Visualization Resources and Tutorials that you may find useful:
Also, the resources that Allison mentioned and some others can be found here:
Website for diagrams: http://www.duarte.com/diagrammer/
Website for data viz: http://datavizcatalogue.com/
best wishes, MikeE