OpenRefine : OpenRefine is a powerful tool for working with messy data: cleaning it; transforming it from one format into another; and extending it with web servic...
Metabase : Metabase is the easy, open source way for everyone in your company to ask questions and learn from data.
re:dash : Query Editor: think of JS Fiddle for SQL queries. It's your way to share data in the organization in an open way, by sharing both the dataset and the ...
D3.js : D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG and CSS. D3’s emphasis on web ...
The GeoNames geographical database covers all countries and contains over eleven million placenames that are available for download free of charge.