Wallpapers:
r/wallpapers: No explanation necessary
https://reddit.com/r/wallpapers

r/EarthPorn: Has lots of stunning high-res pictures of nature
https://www.reddit.com/r/EarthPorn/

WallpaperHub: Has many official Microsoft wallpapers
https://wallpaperhub.app/

Microsoft Design Wallpapers: Even more official Microsoft wallpapers
https://wallpapers.microsoft.design/

Unsplash: A site with high-quality royalty-free images and wallpapers
https://unsplash.com/

Wallpaper collection by <@645751493450006548>:
https://actoweb-my.sharepoint.com/:f:/g/personal/avogato_catphile_actoweb_xyz/EimxR6YeSqpOsZUYKD77I-IBSAZfLNAASmSYx67rTF5CuQ?e=hfSubn

Lively Wallpaper: An app for animated wallpapers
https://livelywallpaper.net/

Wallpaper Engine: A paid app for animated wallpapers
https://www.wallpaperengine.io/

WinDynamicDesktop: macOS-style dynamic wallpapers on Windows.
https://github.com/t1m0thyj/WinDynamicDesktop

Rainmeter: An app to add rich widgets (called 'skins') to your desktop
https://www.rainmeter.net/

SecureUxTheme: An app for non-destructive theme patching for theming win32 apps
https://github.com/namazso/SecureUxTheme
​
Shell customization:
TranslucentTB: An app to change the blur behind the taskbar
https://github.com/TranslucentTB/TranslucentTB/

DwmBlurGlass: Adds Aero-like transluceny to the system titlebar on Windows 10 and 11
https://github.com/Maplespe/DWMBlurGlass

StartAllBack: An app that replaces the taskbar and Start menu adding a variety of features
https://www.startallback.com/

MyDockFinder: A paid macOS-like dock and menu bar for Windows
https://store.steampowered.com/app/1787090/MyDockFinder/

komorebi: A tiling window manager for Windows
https://github.com/LGUG2Z/komorebi/

Yasb: A Unix-like status bar for Windows
Makes a great combination with komorebi
https://github.com/denBot/yasb

Stardock: A company that makes a huge variety of paid shell customization utilities
https://www.stardock.com/products/

Terminal/Shell customization:
Windows Terminal: The modern first-party terminal experience for Windows with profiles, themes and more
https://learn.microsoft.com/en-us/windows/terminal/

Windows Terminal themes: A large collection of Windows Terminal colour schemes
https://windowsterminalthemes.dev/

terminal.sexy: A terminal colour scheme editor
Does not natively support Windows Terminal but can be used through https://heftymouse.github.io/tsconverter/
https://terminal.sexy/

PowerShell 7: The modern cross-platform PowerShell
https://learn.microsoft.com/en-us/powershell/

Oh My Posh: A customizable cross-shell prompt
https://ohmyposh.dev/

Starship: Another customizable cross-shell prompt
https://starship.rs/

Terminal-Icons: A PowerShell module to add file and folder icons to Get-ChildItem and other cmdlets
https://github.com/devblackops/Terminal-Icons

Winfetch: A neofetch-like system information utility for Windows written in PowerShell
https://github.com/lptstr/winfetch

Miscellaneous:
PowerToys: Has a variety of useful utilities including customization programs like FancyZones
https://github.com/microsoft/PowerToys

ShareX: An advanced screenshot and screen recording program
https://getsharex.com/

AeroShot CRE: An app that takes transparent screenshots of individual windows with drop shadow
https://apps.microsoft.com/store/detail/9NNBCDGN1ZS8

Auto Dark Mode: Automatically change theme and other things based on time of day
https://apps.microsoft.com/store/detail/auto-dark-mode/XP8JK4HZBVF435

AccentColorizer: Brings your Windows accent colour to more places
https://github.com/krlvm/AccentColorizer

Mica For Everyone: Allows customizing the material and theme of default titlebars
https://github.com/MicaForEveryone/MicaForEveryone

Internal wallpapers for the iPhone 15 Pro & 15 Pro Max.

Wallpapers

• ⭐ wallhaven
• ⭐ Wallpaper Abyss
• ⭐ Studio Ghibli Wallpapers

UnixPorn, HD wallpapers, WallpaperFusion, WallpaperAccess, Wallpapers.com, Wallpaper Safari, CoolBackgrounds, WallpaperCave, Positron Dream, WalLegend, SkinBase, GetWalls, Wallpapers, DualMonitorBackgrounds, SocWall, ThewWallpapers, WPGallery, wallpaperstock, vlad.studio, Bing Wallpaper, simpledesktops, Mac Wallpapers 2, Microsoft Wallpapers / 2, 3, WallpaperHub, Wallpaper Tip, WallpaperFlare, hdqwalls, uhdpaper, wallpapersden, MovieMania, Xbox Wallpapers, vsthemes, wallpaperscraft, backiee, hdwallpapers, wallpaper-house, pixelstalk, 7-themes, gettywallpapers, wallpaperset, wallpapershome, teahub, sfwallpaper, 99images, wallpaperbetter, wallpaperforu, wallpapercrafter, wallpapersmug, goldposter, pikist, hdwallsbox, wallpaperbat, wallhere, ilikewallpaper, wallup, setaswall, peakpx, itl, papers, pixel4k, suwalls, GDrive Collection, drawstructure, ps4wallpapers, wallha, 4kwallpapers, wallpaperswide, wallpaper.dog, MoeWalls, dwt1

Telegram Wallpaper Channels

wallpapers, ull_HD_4K_wallpapers, WallpapersGram, picsart_hd_background, Anime_WallpapersHD, allwallpaper, Wallpaper, ZedgeImagesBot, picsart_hd_background, wallpaperselection, Hk3To, G_Walls, EZwalls, pengwyn, wallpapersite

Animated Wallpapers

• ⭐ LWP - Wallpapers that Move with Cursor

/r/LivingBackgrounds, wallpaperwaifu, Scenic Illustrations, MyLiveWallpapers, AutoWall, AnimatedBackgrounds, Lively (Create)

Wallpaper Managers

• ⭐ Wallpaper Engine
• ⭐ Wallpaper Engine - PKG to Zip / Collections, 2
• Wallery - Display Wallpapers
• Faerber - Edit Wallpaper to Match Color Scheme

ScreenPlay, backiee, Daily Reddit Wallpaper, Daily Bing Wallpaper, Awesome Wallpaper, tanck.nl, SuperPaper

Mobile Wallpapers

• ⭐ Mobile Abyss
• Darkinator - Change Wallpaper Depending on System Theme
• wallpaperwaifu, Muzei, Chroma Galaxy, Doodle, GIFLiveWallpaper, AnyVideo, Ornamental, Reddit Wallpaper, Amoled Backgrounds or LiveLoop - Live Android Wallpapers
• DualWallpaper - Auto Switch Light / Dark Mode Wallpapers
• Dynamic Wallpaper - Wallpapers that Change Based on Battery
• koncius - Android Video to Wallpaper
• Das Image - iOS Wallpaper App

Wallpaper Engine, wallhaven, wallpaperfusion, wallpaperaccess, wallpapers.com, wallpapersafari, wallpapercave, positrondream, wallpaperstock, simpledesktops, wallpapertip, wallpaperflare, hdqwalls, wallpapersden, moviemania, iOS Wallpapers / 2, VectorifyDaHome, backiee, Wallpapers_Phone_Mobile, iphone11papers, Wallpapers Clan, Wallme, WallYou, Mobcup, Absolutely Walls, noir arts, /r/iWallpaper, WalliApp, /r/Verticalwallpapers, /r/MobileWallpaper, Zedge