SugarCRM, a free and open-source version of customer relationship management system (CRM).

Tarantool, a NoSQL in-memory database and application server.

TensorFlow, an open source software library for machine learning.

Theano, a numerical computation library for Python.

Torch, a scientific computing framework with wide support for machine learning algorithms.

Tracks, a GTD web application, built with Ruby on Rails.

WordPress, a free and open-source content management system (CMS) based on PHP and MySQL.