Photopea - Online photo editor, which can work with PSD, XCF and Sketch files (Photoshop, Gimp and Sketch App).
Online Video Templates by Pixiko - Discover stunning free video templates, pick and edit
Replace Cover - Create beautiful cover art for your Spotify playlists
SocialSizes - Sketch templates for sharing images & videos on social media
Headers.me - Create social cover images that get you followers
Instagram Story Templates by Kapwing - Create simple, beautiful Instagram Stories from templates