Gedit is the default text editor for CrunchBang Full, it is accessible from the menu under 'Text Editor', it also has a keybinding W-t (windows/Superkey-t) assigned to it. Gedit is a full featured text editor, including search and replace, syntax highlighting, spell checking, tabs and is extensible through plugins.
Preferences can be set under Edit → preferences on the top level menu. It covers things such as syntax highlighting colours, tab width and manages plugins. Further options for the look of Gedit can be set under 'View' on the top level menu, the tick boxes can configure whether things like the side bar or tool bar are shown.
Gedit is extensible through plugins, installed plugins can be seen under Edit → Preferences → Plugins (tab) on the top level menu.
Plugins need to be downloaded and saved to ~/.gnome2/gedit/plugins, they may come with their own specific installation instructions which should be preferred over this walkthrough.
tar xvzf ~/downloads/downloaded_file.tar.gz
Note: this assumes the file is a tar.gz archive, see the man page for other options
cp -r ~/downloads/downloaded_file/* ~/.gnome2/gedit/plugins