For visualisation, there are many to try out like Flourish and Datawrapper. If you're more technical and using Python or R, have a look at this summary of libraries.
For creating infographics, there are tools like Infogram.
For mapping relationships or networks as a story try GraphCommons, see this example of three musicians in a recording ecosystem. Kumu is also popular for network visualisation.
Extracting and cleaning data
If you want to get data tables out of PDFs you can try Tabula, pd3f, or Excalibur/ Camelot.
If you want to extract and analyse text in articles or books (e.g. to identify people and places) there are lots of tools to try like TextRazor, Intellexer and Google's Natural Language.
Mapping spatial data
For mapping, something like Kepler is easier to use. For more detail on other tools and working with spatial data see this page.