Pika.style - A free tool to quickly convert screenshots into beautiful website and device mockups. You can create customizable images for App Store, Instagram, and more
Artboard Studio - Online graphic design app mainly focused on product mockups.
Supasnap - Beautify your screenshots instantly.
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.
Xnapper - Take beautiful screenshots instantly
Snappa - The perfect graphic design tool for digital marketers.