The Gedit "builder" plugin is a plugin for the Gnome Text Editor that allows you to compile source code and then click on the compiler output errors to go to those errors in the source code.
DEE Excellent Editor is a simple source codeeditor whit syntax highlighting for many languages with a file browser panel to quickly select files. DEE can open files from the local system or directly from an ftp server.
GtkEditor is a source codeeditor widget for GTK+. It currently handles source code
highlighting based on regular expressions. In the future it will handle
automatic/semi-automatic indenting and parenthesis matching.