You’re welcome to use whichever tools you prefer for your data visualizations, but these are the tools with which we have the most experience and recommend:
You can get pretty far with Excel’s built-in charts and graphs. They often don’t look wonderful, but if they work, they work! Data at Work, by Jõrge Camoes, is a very thorough look at how to use Excel for data visualization.
Tableau has a lot of advanced features and documentation. If you want to install it on your own laptop, choose Tableau Public. This tool can be a little overwhelming at first, but the Lynda library has video tutorials; you might start with “Up and Running with Tableau.”
You can make some really cool graphs and charts with RAW, and it’s easy to embed them on a website. The alluvial diagram is always a big hit!
Quadrigram is a drag-and-drop, web-based tool for data visualization that’s pretty easy to use, and it’s pretty easy to embed the charts and graphs in your website.
DataWrapper makes great-looking, simple, embeddable data visualizations. Definitely recommended if you’re not trying to do anything super-complicated.
I love Palladio, but it’s important to understand what it is and what it isn’t. It’s designed for the exploration (not necessarily the presentation) of humanities data. So while you can produce some impressive visualizations, you can’t really embed them. (You can take screenshots, though!) I have a full tutorial here.
If you want to compare and contrast many images with each other, you can try ImagePlot, but just be aware that it’s not super-easy to use and we haven’t tested it in awhile.
Want more tools? Here’s a huge list.
Whatever tool, you choose, be sure you pick the right visualization for your data.