Repo with icons, backgrounds in .png and .psd formats:
https://github.com/vcmi-mods/h3-themes/tree/vcmi-1.7/h3-themes/mods/_Support/mods/german-translation-theme-beta/mods/font_h3/content/data
https://vcmi.eu/Mod%20Repository/Interface/Main%20Menu%20Themes%20Pack/#h3-font
Adobe Photoshop for free:
https://www.photopea.com/
Playfair Display. Font that looks the same as Heroes Main menu font:
https://fonts.google.com/specimen/Playfair+Display
Site with all assets for HOMM3:
https://www.spriters-resource.com/pc_computer/heroes3/
Tool for accessing all game assets with .lod extension. Useful for the main menu theme:
https://www.vault.acidcave.net/file.php?id=112
Backgrounds:
https://heroes.thelazy.net/index.php/Category:Loading_Screens,_Box_Art,_Menus
https://wallpapercave.com/might-magic-heroes-3-wallpapers
https://www.heroes3.eu/en/download/tapety
Gemini conversation:
https://gemini.google.com/share/e1a5510d0ff2
Font:
https://fontstruct.com/fontstructions/show/1222594/pixelated_times_new_roman