If you want a text editor similar to Notepad++ for Windows, you can try Notepadqq which is an open source editor with great features. With Notepadqq, you can do the following tasks:

Syntax highlighting
Real-time highlighting 
Code folding
Color schemes
File monitoring
Multiple selection
Tabbed documents, etc.

Notepadqq can be easily installed under Ubuntu 14.10 using the following PPA:

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Source:upubuntu