Creative Market - Buy and sell handcrafted, mousemade design content like vector patterns, icons, photoshop brushes, fonts and more at Creative Market.
Graphicriver - Hand Reviewed Design Items for Any Creative Project
Flaticon - A database of free vector icons.
Slides Carnival - Free quality presentation templates for Google Slides
Theme Forest - The #1 marketplace for premium website templates, including themes for WordPress, Magento, Drupal, Joomla, and more. Create a website, fast.
Slidesgo - An extensive catalog of free Google Slides themes and PowerPoint templates.