A cloud based tool to distribute your brand assets. It's a bit pricey for small companies, but really cheap based on what the big guys pay.
Proto.io = great cloudbased prototyping.
I have been looking for a product that would help me turn my ideas into working prototypes. My partner Kristin Sloan found Proto.io, which we compared against Moqups.com So far I have been really happy with how proto.io handles itself.. it took a bit of time to understand the relationship between elements, but now that I have a working knowledge, it's getting fast...
If you make stuff, you should watch this.
Mike Monteiro gives a great talk on responsible design practices, and what we are all doing wrong.