This is the well-known text editor included by default in the GNOME desktop environment. I liked that Geany is well documented (via the Help menu). It supports highlighting for various scripting and programming languages, indentation, and it provides enough options to configure it the way you want. Geany is a text editor with basic IDE capabilities which provides a good alternative to Gedit, the GNOME editor. A couple of months ago I wrote a full Kate review which you can read here. Kate is the complete text editor for any KDE user. It supports sessions, plugins, encodings, bookmarks and even the possibility to split the current document horizontally or vertically. It can also be used successfully as an IDE (integrated development environment) and supports, among many others, spell-checking, highlighting for a huge amount of programming languages, it has an integrated terminal (which inherits Konsole's settings), encoding support. Kate is the default text editor in KDE, and also one of the most powerful and feature-rich text editors available for Linux. Update: I made a couple additions and now the review includes no fewer than 16 text editors.

Pspad vs ultraedit vs notepad++