Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Brutal Teardowns - Get honest feedback and actionable advice for your website
Invision - Prototyping and collaboration for design teams
Brand.ai - Create a style guide & integrate with Sketch, Slack, & Gulp
Sketch - Professional digital design for Mac.
Frontify Workspace - The overall tool for creative & design collaboration: - upload, manage & share assets