I have just came across a blog featuring high-quality charts visualizing all kinds of data: https://datasoaring.blogspot.com. Charts are made with plot.ly, highcharts, bokeh, charte.ca and other tools. Some charts are published as high-quality animated GIFs. Apparently, the blogger uses this data format as a last resort - not so many tools out there support animation right out of the box. Anyways, good to see charte.ca in a good company.