Competitors

Text editors:

• Atom
• Sublime Text
• vim
• emacs
• jEdit. In java. Extensible with plugins.
• JuffEd In C++, Qt and QScintilla.
• Kate. KDE editor
• SciTE. Scintilla
• khteditor In PyQt, for maemo
• Sublime Modern text editor. Free but not open source. Seems good
• Notepad++ Windows-only, but easy to use.

IDEs:

• M$ Visual Studio Express
• XCode. Mac OS X IDE for C/C++/Objective-C/Objective-C++.
• Qt Creator. Created by Nokia (Trolltech). Official IDE for Qt.
• KDevelop. KDE IDE
• Eclipse. In Java. For java and many other technologies.
• Geany. In C++ and GTK2.
• NetBeans. In Java. Releases for various technologies. Java, C++, PHP
• Anjuta DevStudio. Uses Scintilla and GtkSourceView editor components
• Eric. In Python, Qt and QScintilla.
• CodeLite. WxWidget, seem to be good concurrent.
• Ninja IDE In PyQt
• Spyder Scientific PYthon Development EnviRonment. PyQt

Code component? https://launchpad.net/codeaide