Designstripe

Creative Market offers four featured assets each week of different graphics, templates, fonts, and more.

Pngtree PSD provides a wide variety of Photoshop files in different styles and sizes, all of which are available in high resolution.

ManyPixels offer 2500+ royalty-free illustrations available for instant download. You can choose a category, select a design type (outline, monochromatic, isometric, etc.) and adjust the colors.

Illustrations XYZ is a curated directory of free vector and illustrations websites. The site features many valuable resources and has a search engine and filters by format' function for easy navigation.

Control Rocks offers 108 illustrations for personal and commercial use in two styles. The free version includes only .png images.

Illustration libraries for everyone is a Figma plugin that allows you to insert high-quality illustrations right into Figma. Just drag and drop to add it to Figma. All the illustrations are released under a creative commons license.

Scale by Flexiple offers 200+ high-quality open-source royalty-free vector illustrations for commercial use and with no attribution. You can also change the colors before downloading them as .svg or .png files.