I do most of my analysis using python and the amazing tools available for scientific python.
Descent: tools for doing unconstrained and constrained first-order optimization in python.
Proxalgs: proximal operators and algorithms in python.
Pyret: a set of python modules for analyzing retinal electrophysiology data.
Jetpack: useful python utilities.
Tableprint: a small library for printing ASCII formatted tabular data to the console in python.
Image processing toolbox: a collection of useful Matlab scripts for generating and processing images.
d3-angular examples: a set of data visualizations using Angular.js and d3.js
Project Euler in Julia: solving some Project Euler problems using the Julia language.
Heather: a command-line weather app built in Haskell.