https://superhivemarket.com/products/get-sheet-done

• Spritesheet generator for Blender.
• Generate grid-based spritesheets right inside Blender from images or when rendering an animation. Spritesheets are mostly used in popular game engines as animation sheets.
• You don't need any external software - just Blender and this addon - which means it's perfectly integrated with Blender and will run on any platform, with any render engine or image file Blender can use.
• So if you need to combine sprites into a spritesheet or just merge couple images and would like to do that quickly and easily inside Blender - this addon is for you.

https://pixelbuddha.net/effects/4668-artistic-watercolor-photo-effect

• This asset turns everything into soft-focus artwork: book covers, poetry chapbooks, art retouch portraits, posters, t-shirt designs, etc. It looks authentically hand-painted with layered washes and bleeding pigments. The effect includes two Smart Object-equipped PSD files — vertical and horizontal — optimized for quick edits and versatile layout needs. Visually, it leans into romantic minimalism, indie publishing, modern bohemian, or dreamy Japan and Korean-inspired aesthetics.

https://superhivemarket.com/products/univ

Blender Addon for UV Editor which aims to cover all sorts of operators for working with UV