What are some alternatives?
OpenBrand - OpenBrand helps designers, agencies, and brands work together. It is a smart home for all your logos, designs, and other creative stuff.
Brandfolder - One link to all your marketing assets. Brandfolder is your convenient source to visually organize, quickly find and easily share all your final brand assets.
pilcro - Get all your brand assets in one place with free brand guideline software. Access your brand assets quickly, save and share with Google
Brandy - Keep brand assets in sync with your team and right at your fingertips for quick use.
Branding Guide - Streamline brand management with online brand guides.
zeroheight - Organize and share your design libraries