Hammer has some built in features that happen automatically, and some clever functions you use with special Hammer tags

HTML Includes
Front-end developers shouldn``t have to run local server environments, or use PHP just to put one HTML file inside another. With Hammer, you don``t have to.

Clever Paths
Wouldn``t it be great if you could just reference an asset by name? Hammer will search your project for the file you reference, and write the file-path for you automagically.

Variables + Helpers
Set and use variables in your template files and bend your templates to your will. Hammer also adds helpful classes to your HTML link tags, making menu logic a thing of the past.

Auto Reload
Every time Hammer finishes compiling your project, it automatically refreshes your browser to show your latest changes and keep things up-to-date.

SASS + CoffeeScript
Hammer knows all about SASS, SCSS CoffeeScript and will automatically compile them to CSS JavaScript. You can also use special tags to reference them in the head.

Publish Builds
With Hammer``s one-click publishing, you can share your work using a unique short URL. Show your clients, get feedback, then iterate quickly and easily.

Requirements: OS X 10.7 or later, 64-bit processor

App Store:
https://itunes.apple.com/us/app/hammer/id548600167?mt=12