I use
http://brackets.io/Brackets
About Brackets
Brackets is an open-source editor for web design and development built on top of web technologies such as HTML, CSS and JavaScript. The project was created and is maintained by Adobe, and is released under an MIT License.
Guiding Ideas
FOR THE WEB, BY THE WEB
Brackets is built using HTML, CSS and JavaScript. If you can code in Brackets, you can code on Brackets.
OPEN DEVELOPMENT WORKS
Brackets, is a fully open-source, community-driven project. Want to influence its direction? Join the developer list and start contributing.
TOOLS SHOULDN'T GET IN YOUR WAY
Rather than clutter your workspace with floating panels, toolbars and icons, Brackets focuses on providing “Quick Edit” in-line views that provide context-sensitive access to your content, without taking you away from your code.
WORKS WITH YOUR BROWSER
The browser is your design view. Brackets hooks up directly to the browser, allowing you to design and develop in the same environment that you deploy.
plus you can see your changes as you make them in real time
Best of all its Maintained by Adobe and it is free and developers can contribute to the build it they so wish
System Requirements
Mac OSX
Multicore Intel processor
Mac OSX v10.6, v10.7 or v10.8
256MB of RAM (2GB of RAM recommended for Live Development)
200MB of available hard-disk space for installation
1280x800 display with 16-bit video card
Windows
Intel® Pentium® 4 or AMD Athlon® 64 processor
Windows XP, Vista, 7 or 8
256MB of RAM (2GB of RAM recommended for Live Development)
200MB of available hard-disk space for installation
1280x800 display with 16-bit video card
Download brackets