Package Control is the very first package anyone should install for Sublime Text. It makes it easy to install any other package without having to clone Git repositories or work through Sublimes file structure. And the author has made it relatively easy to install Package control as well. All that is required is a quick copy and paste of code provided on the developers website. Package control makes it easy to install new packages, snippets, themes, and color schemes.
Emmet is a tool for web developers that allows you to use CSS style prefixes to quickly generate html code. It allows quick generation of boilerplate HTML with a familiar syntax, so you can focus on code instead of markup. The github project for the package is here
Clipboard History is a nice little utility that lets you see the recent history of your clipboard. It only works for snippets copied from within Sublime Text, but its a nice little tool for refactoring, when you’re moving code around quickly and want to delete something without losing it completely.
In the end different packages work for different people. I highly recommend installing Package Control and browsing around through the options. If you find a great package, leave a comment here and let me know. There are a lot of packages out there, and everybody’s needs are different