Here are some cool websites.

Internet Archive → the digital library of everything and the Wayback Machine
Neal.fun → playful interactive web games
LibriVox → free public domain audiobooks read by volunteers
xkcd.com → Randall Munroe web comic
Motherfucking Website → brutalist web design rant
Uncommon Ephemera → preserving filmstrips
WordPress → web CMS
Tilde.club → tiny personal websites
Plain Text Sports → live sports scores in plain text
Radio Garden → spin the globe, listen to live radio
Window Swap → look out someone else’s window
MapCrunch → random Street View teleporting
The True Size Of → compare country sizes on the world map
This Is Sand → make layered digital sand art
Pointer Pointer → find a random photo pointing to your cursor
Wait But Why → funny, smart longform articles
The Useless Web → take me to a random useless site
Bored Button → click for random entertainment
Heeeeeeeey → just… heyyyyyyyy
Jawed.com → photos by YouTube co-founder
Hexcodle → Guessing colors
Transparent Textures → Transparent Textures
Textfiles.com → A digital time capsule of 1980s–90s BBS-era underground text culture
Htwins.net/scale2 → The scale of the universe

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Here are some cool apps.

Niagara Launcher → A minimalist app launcher for Android devices
Living Worlds → Dynamic pixel art live wallpaper for Android devices