Pro Plugin manager
LT has a plugin manager built directly inside of it, this plugin manager connects to LT's own registry of plugins, so whenever you want assistance while writing your HTML, JS or even Python, just open up the plugin manager search for it and click the little install button beside it's name. And your plugin will be installed. Yes it's that easy!
According to its authors LightTable allows you to "watch your values flow through your code". Which essentially means you could see your code running live AS YOU TYPE IT! .This innovative feature makes lives a lot easier for developers, because now with LT you can debug your code LIVE while writing it. This of course would lead to considerably lesser programming errors.