DeepMind (Google's AI)

DeepMind

Excerpted from DeepMind website:

DeepMind's scientific mission is to push the boundaries of AI, developing systems that can learn to solve any complex problem without needing to be taught how. To achieve this, we work from the premise that AI needs to be general. Agents should operate across a wide range of tasks and be able to automatically adapt to changing circumstances. That is, they should not be pre-programmed, but rather, able to learn automatically from their raw inputs and reward signals from the environment. There are two parts to this research program: (1)  designing ever-more intelligent agents capable of more-and-more sophisticated cognitive skills, and (2) building increasingly complex environments where agents can be trained and evaluated.

Train AI agents through gamelogic
Open source, GNU GPL v.2 licensing (free for private / commercial use, with GNU GPL rights clause)
Available on GitHub

Ren'Py

Ren'Py

Excerpt from Ren'Py website:

Ren'Py is a visual novel engine – used by hundreds of creators from around the world – that helps you use words, images, and sounds to tell interactive stories that run on computers and mobile devices. These can be both visual novels and life simulation games. The easy to learn script language allows anyone to efficiently write large visual novels, while its Python scripting is enough for complex simulation games.

Ren'Py is open source and free for commercial use.

Python

Python

Used for:

1. full stack development (web dev)
2. scientific and numeric computations
3. programming education
4. desktop GUIs
5. software development

Open source programming language with robust community. Originally created in the early 1990s, Python has been around, developed, and implemented into a plethora of products.