Hammer for Mac
I haven't dribbled too much of this app while it's been in development because we wanted to keep it secret, but I've been working on this for quite a few months and we released it today so thought I'd give it a mention!
Hammer is a web development tool for Mac that a lot of you should find really useful when you're working with static HTML sites or building out templates for projects. We have some clever things for adding HTML includes, referencing assets dynamically and even setting and using variables (all in a static HTML build), along with the usual stuff like automatic reloading and language compilation. You can also publish your builds with short URLs to show clients or share with others.
Check out the website at http://hammerformac.com (built by @kachunchau) and grab a trial version if you're interested!