Scikit-learn - scikit-learn (formerly scikits.learn) is an open source machine learning library for the Python programming language.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Pandas - Pandas is an open source library providing high-performance, easy-to-use data structures and data analysis tools for the Python.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
NumPy - NumPy is the fundamental package for scientific computing with Python
Pomodone - Pomodone is the easiest way to track your workflow using Pomodoro technique, on top of your current task management service.