Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Brutal Teardowns - Get honest feedback and actionable advice for your website
Sketch - Professional digital design for Mac.
Brand.ai - Create a style guide & integrate with Sketch, Slack, & Gulp
Affinity Designer - Professional creative software, exclusively for Mac.
Frontify Workspace - The overall tool for creative & design collaboration: - upload, manage & share assets