You can export visualizations from multiple dashboards available at Knoema in Viz of the Day and Data Insights sections as well as from your personal dashboards (read the article on how to create dashboards for details).
Infographics from Viz of the Days can be exported as an image.
Data Insights are also exportable. If you export the whole dashboard to Excel or Powerpoint, you will get each gadget on a separate page. If you export to PDF, you will get a document looking similar to the original dashboard.
You can also export separate gadgets by clicking Export in a gadget menu.