How to install plugins to Sublime Text 2 editor?

Question

How to install plugins to the Sublime Text editor?

I would like to install Emmet plugin to Sublime Text 2 editor.

Answer 1

Without Package Manager

I highly recommend using the Package Manager as described in other answers as it's far more convenient for both installing and updating. However, sometimes plugins are not in the directory, so here is the manual approach.

First off, find your Packages directory in your Application Support/Sublime Text 2 directory, for example:

~/Library/Application Support/Sublime Text 2/Packages

Now, take your Plugin folder (which you can download as a zip from GitHub, for example) and simply copy the folder into your Packages directory:

cp ~/Downloads/SomePlugin-master/ 
   ~/Library/Application\ Support/Sublime\ Text\ 2/Packages/SomePlugin`

Restart Sublime Text 2 and boom! you're done.

With Package Manager

Refer to one of the other answers here or go to the Package Manager home page.

Bonus Points

If there's a plugin that isn't in the Package Manager, why not submit it on behalf of the author by following the steps found here.