Before there were full IDEs to teach kids to code with languages like Scratch and Alice, there was Logo. There's still Logo today if you want to use Logo Interpreter in your browser and have all of the fun of its stripped-down syntax built when bandwidth was measured in baud and every keystroke counted. It has a simple elegance that can't be matched with all of the modern tile-dragging and button-clicking.
The '70s never died. Not only can you emulate your old Commodore 64 games on the Web, but you can keep that 1970s Basic code running too. Well, that may be a bit of an exaggeration because there have been so many dialects over the years. But you can still create something new and current with all of the simplicity that made Basic popular.
Another commercial option is SpiderBasic, a modern version said to be built in the tradition of PureBasic. It offers access to all of the HTML5 and WebGL hooks necessary for building a modern, multiwindow Web app.
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