In public website try using domain name and get data set as well as workbooks.
Please google it for the other open source data set.
Today there is a wonderful information shared by tracyrodgers in community digest . Here is it Ever looking for new data sets? Check out how Jewel Loree gets some of her data from Wikipedia in - http://www.tableau.com/about/blog/2016/2/excavating-data-gems-wikipedia-50966 . Hope this will help you out.
I have a website -- www.thedemographics.com -- where you can download for free several Tableau-ready workbooks with American Community Survey data. These are national census tract files pre-loaded into Tableau. A custom geocoding file is included to establish the census tract geographic role. Also included are Mapbox background maps which can be used or swapped out for the Tableau background map.
I've been a bit frustrated at not being able to customize the background demographic information in Tableau, so this is my attempt at bringing in a broader array of demographic data for Tableau users. You will see, for example, that I've done symbol maps (bubbles) at the tract level but Tableau can roll the data up to county level for filled maps as well.
These datasets are entirely free with no obligation, although since I am testing the usefulness of this distribution method I would respectfully ask for any and all feedback as to your "user experience" and whether you think the data are useful to you. I sincerely appreciate your comments after you have had a chance to use the data. That goes for anyone else out there as well! Thank you!