Yes, there is a free/open-source T-SQL formatting plugin for Notepad++, called “Poor Man’s T-SQL Formatter”. It is available in the NPP “Plugin Manager” plugin list (gets updated every once in a while automatically), and is also available for manually downloading/installing from here: http://www.architectshack.com/PoorMansTSqlFormatter.ashx
If you just want to check it out without adding to notepad++, you can check the online formatting site:
http://poorsql.com
(disclaimer: I wrote these tools :))