Redash - The free & open sourced Chartio

Redash is the free and open sourced alternative to all these business intelligence tools. (e.g. Chartio, Mode analytics, Tableau, Periscope.io) This open sourced application has all the bells and whistles you need. It does charting, it can allow you to share data with co-worker by just a link, it runs queries in the background so that you always see the latest data instantly, it even gives you an json API to query the data with a custom query string. If you don't want to spend thousands of dollars a month on a competing BI tool, this is the perfect solution.