Google has released a slew of tools that designers and developers can use to build app interfaces. While they appear to be tied to the company’s Material Design language, which it launched in 2014, it looks like you’ll be able to use them regardless of what design principles you choose to follow.
Gallery lets you upload, share and comment on designs. It offers version control as well as a way to present your work without the need to attach PDFs or slide decks. If you’ve used collaboration tools like InVision, Gallery might seem familiar to you.