You need to be a bit careful with these as adding lots of them can really slow Sublime Text down.
I found this list of handy addons while looking around for a way to get grunt running from within ST. It starts off with installing the excellent Package Control which makes installing and managing addon packages sooooo much easier. Trust me on this. I found it only after an annoying process of manually installing an addon. With Package Control those days are gone for good.
Now that was a weird sentence to write.