Building games in the web browser using the Crafty game engine. Based on a tutorial on Build New Games by Darren Torpey.
One of many similiar tools that gives you all the basic tools you need to build a game that runs in a web browser.
This is a program you can use to build levels for your games. We would have to write some code to load the level into our own game.
This is a good list of sites where you can find free are for games including characters, map textures, and sounds.