I finally managed to add a half-decent film grain effect to a photo. (explanation of how I did it in comments) : r/GIMP
Film Grain Textures 8K FREE PACK on Behance
Grain Effect Images – Browse 194,275 Stock Photos, Vectors, and Video | Adobe Stock
How to create a traditional grain effect in Photoshop Elements | Photoshop Creative - Photoshop Tutorials, Galleries, Reviews & Advice | Photoshop Creative Magazine
Film Grain Overlay Images – Browse 14,251 Stock Photos, Vectors, and Video | Adobe Stock
How to Simulate Perfect Film Grain in Photoshop — Medialoot
Simulate Film Grain In An Image - Photoshop Tutorial
Add a film grain effect to digital photos. A Photoshop plug-in
3 Ways to Add High Quality Film Grain Using Photoshop | PetaPixel
40 Free Film Grains And Film Burns Textures For Your Design | Naldz Graphics
Film Texture Overlay stock image. Image of light, movie - 174871947
Film Grain Textures Free Download
Film texture - grain explosion by JakezDaniel on DeviantArt | Film texture, Film grain texture, Texture photography
How to Create Film Grain Texture in Photoshop - Lenscraft