Games

Twine

• Authoring
• Games
• Interactive Narrative
• Writing

Write interactive narrative fiction (the online version). Create your own adventure game!

Godot Engine

• Coding
• Games

Free, open source games development environment. One day, I'll get round to having a go with Godot.

Downpour

• Authoring
• Games
• Gamification

Fun mobile app (Android, iOS) with which you can make quirky games.

Study Crafter

• Game
• Games
• Interactive Narrative

An amazing tool to create interactive games with a flow-coding interface, but equally could be used to make training materials. The primary use for this tool is to collect research data about what choices people made.

Free.

PyGameZero

• Games
• Python

Successor to Pygame, PyGameZero is a python-based game engine that is fun to use, easy and powerful.

List of Game Development Tools

• Games

Everything from Twine to Unity... tools to make games.

GDevelop

• Game
• Games

Create 2D games without coding. 

The Museum of Screens

• Game
• Games

Interesting "walk" through internet time

Great List of Games

• Game
• Games

53 best browser games you can play for free.