These are slides and some code from my JSConf EU 2014 talk on esoteric programming languages.
Play around with befunge at http://befungius.aurlien.net.
To test the Thue interpreter, run node thue.js hello.thue (or try beers.thue).
To see the slides, run npm install and then make it happen.
If running the slides gives you a segfault, open the file node_modules/slid.js/node_modules/picture-tube/node_modules/png-js/png-node.js and insert a no-op (something like if (1==1) {}) below line 294. Don't ask me why.