I build web apps. So currently its:

 - XHTML
 - JavaScript
 - C# as part of the
 - ASP.Net Framework (this _sort_ of is a language too) 
 - T-SQL for database communication
 - English for communicating with humans.


Editors: Sublime Text (out of choice), Visual Studio 2010 (no other feasible choice when it comes to ASP.Net)