Drupal, a free and open source content-management system and framework written in PHP.

Joomla, a free and open source content-management system and framework written in PHP and JavaScript.

Jupyter Notebook, a browser-based interactive notebook for programming, mathematics, and data science.

Keras, an open source neural network library written in Python.

Memcached, an in-memory key-value store for small chunks of arbitrary data.

MongoDB, a document-oriented NoSQL database server.

MXNet, an open-source deep learning framework.