The best ZxSpectrum game emulator online.
http://torinak.com/qaop
Click on Top left to see options!
I keep coming to these pages, they are so inspiring on what can be done on the web… I may have already posted some of these links.
http://acko.net/
http://acko.net/files/fullfrontal/fullfrontal/webglmath/online.html
http://threejs.org/docs/index.html#Manual/Introduction/Creating_a_scene
http://www.realtimerendering.com/blog/
http://www.iquilezles.org/default.html
Leanpub free tutorial (you may need to register but the book is free)
HTML 5 Shoot ’em Up in an Afternoon
Step by step and easy reading tutorial explaining how to make a game in javascript with the Phaser gaming framework.
Using the brand new Unity native 2D tools, you will learn how to make a small “Shoot’Em Up” (abbreviated to shmup thereafter) with this tutorial.
http://pixelnest.io/tutorials/2d-game-unity
http://gamemechanicexplorer.com/
A collection of concrete examples for various game mechanics, algorithms, and effects. The examples are all implemented in JavaScript using the Phaser game framework, but the concepts and methods are general and can be adapted to any engine.
Your free, easy to use and flexible tile map editor.
http://threejs.org/
Amazing graphics framework in javascript. Check the demos!
Phaser is a fun, free and fast 2D game framework for making HTML5 games for desktop and mobile web browsers, supporting Canvas and WebGL rendering.