My favorite tool for data analysis is R.
I have used it for a few years now, I feel at ease when I need to work with tabular data. Using R makes my work enjoyable. I can clean my data in one place - RStudio - and then work with it creating new graphics. I also enjoy learning new things in R. Its constant development gives you the chance to learn a bit more every day. This is thanks to a huge collaborative community that supports you, with quick answers, with examples, and with new packages.
– Paula Andrea Martinez, Data scientist / Postdoc / Data Analysis and Bioinformatics. @orchid00