Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
Phigma - 100+ Figma templates for your Product Hunt images
Canva - Canva is a graphic-design platform with a drag-and-drop interface to create print or visual content while providing templates, images, and fonts. Canva makes graphic design more straightforward and accessible regardless of skill level.
Zeplin - Collaboration app for UI designers & frontend developers
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Figma 101 by Designlab - Learn Figma in this free course w/ downloadable templates