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.
UI Movement - The best UI design inspiration, daily
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
UI8 - Carefully crafted UI design assets
Scribus - Scribus is a desktop publishing (DTP) application.
UI Garage - Specific mobile and web design patterns for your inspiration