FrontendSource - Curated dev & designer resources updated weekly
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Material Up - Curates the best of Material Design inspiration, tools and freebies.
Issuu Collaborate - Issuu Collaborate offers a way for teams to work together on creating content for publishing.
Atomic - The fastest way to design beautiful interactions
avocode - Centralize design collaboration, version control, prototyping, feedback, and developer hand-off with Avocode. Work on any design, anywhere, with anyone. Sign up free 👉 https://avocode.com/.