What are some alternatives?
zeroheight - Organize and share your design libraries
pilcro - Get all your brand assets in one place with free brand guideline software. Access your brand assets quickly, save and share with Google
Identihub - Self-hosted Open Source brand & assets management software
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.
Patternry - A tool for building living UI libraries
Pics.io - Pics. io is a cloud service that people can use to manage their creative content and files, collaborate with their peers on this content, and then share the content with their clients. Read more about Pics.io.