XMind is currently the most popular, user-friendly mind mapping & brain storming software from Hong Kong in China. It was written in Java (cross-platform), based on the most advanced Eclipse RCP architecture (thematic structure as plug-in, supports flexible add-ons extension).
Killink CSV (full name: Killink CSV Editor, has been discontinued) is a small and practical spreadsheet-like text editor dedicated to quickly view and edit comma, tab or any character separated/delimited text files.
As the world's top Excel expert, nobody knows more about Excel than John Walkenbach. And 101 Excel 2013 Tips, Tricks and Timesavers is one of the most classic works for Excel, which can help you easily work out report forms, become good at data analysis, fast beautify the Excel charts, etc., almost in one hour.
Microsoft Excel is the powerful, widely used and most popular spreadsheet software. Almost every computer user should use it sometime, meanwhile it is also a relatively complex software to use.