Notepad++ is not available for Xfce but there are a few alternatives with similar functionality. The best open source Xfce alternative is SciTE. If that doesn't suit you, our users have ranked more than 100 alternatives to Notepad++ and four of them are open source and available for Xfce so hopefully you can find a suitable replacement. Other interesting open source Xfce alternatives to Notepad++ are Mousepad, MadEdit and medit.
SciTE is a SCIntilla based Text Editor. Originally built to demonstrate Scintilla, it has grown to be a generally useful editor with facilities for building and running programs. It is best used for jobs with simple configurations - I use it for building test and demonstration...
A simple and hackable notepad.
A simple text editor for the Xfce desktop environment. Mousepad aims to be an easy-to-use and fast editor for quickly editing text files, not a development environment or an editor with a huge bunch of plugins.
It doesn't have many of Notepad++'s features. But for most of the basic functionality, it's a great alternative.
medit is a programming and around-programming text editor.
Started originally as a simple built-in editor component in GGAP, it grew up to a real text editor.
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A simpler version of Notepad++. Supports all the jazz you'll need: syntax higlighting, it's clever with Tabs, mass renaminc, etc. No macros though.