NEW: toolbox.schoolofdata.ch - a collection of open source tools organised and presented according to the School of Data pipeline.
Other software used regularly by folks around here:
Visit the Data Journalism Handbook to learn how data visualisation works, and dataviz.tools for more…tools. To learn to explore tabular data, check out the Analyzing data, Cleaning data and Spreadsheet Formulae tutorials.
For geodata wrangling visit our Open mapping workshop thread.
Feel free to share your own!