Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.
CotEditor - Open Source Plain-Text Editor for OS X
GNOME - An easy and elegant way to use your computer, GNOME is designed to put you in control and get things done.
Fraise - Fraise is a Powerful Lightweight Editor for Mac OS X Snow Leopard.
Eclipse IoT - Eclipse IoT provides the technology needed to build IoT Devices, Gateways, and Cloud Platforms.