LAREXjs
Javascript port of the LAREX library using OpenCV compiled to WebAssembly. This is still at an early stage of development, not feature complete, without user interface, and will probably eat up all your memory because I forgot to clean up some webasm garbage.
You can see it in action over here: Try it!.
Building from source
Compile opencv.js according to the official tutorial and put it in src/opencv. Install broserify (or watchify) and run:
browserify src/main.js > larextest.js