HackISU!
A real optical illusion and demonstration of 1/2 walls
Example of using TriMap for a game map
Escher-type optical illusion
A picture of a stadium with player and non-player tokens

TriMap

TriMap is an image creation program on an isometric projection grid that runs in any web browser.

It can be used for:

sketching 3d maps
creating optical illusions
playing around with isometric drawing

Built using HTML5 Canvas, TriMap is an interactive web page where you create drawing elements from the sidebar and then drag them around on the isometric grid. Drawing elements:

Tiles
Walls
1/2 Walls
Stairs
Doors
Tokens to represent characters

TriMap was written by Grinnell College students Pouya Mahdi Gholami '20, Griffin Mareske '20, and Philip Kiely '20 at HackISU '17. TriMap was written using the Konva library and was inspired by a reddit post. It is available under the GPL version 3 license.