Homestar Runner: A classic flash website! (Req. Flash)
Peasant Quest: This is a great game that mimics old PC games. (Req. Flash)
Club Penguin Rewritten: Relive the glory days of Club Penguin. (Req. Flash)
Candy Box 2: ASCII-based idle RPG adventure game!
Agar.io: A game where you're a cell trying to be giant.
Slither.io: Eat other snakes and stuff.
Wikiverse: Wikipedia, as a universe.
Uncyclopedia: Wikipedia, but dumber.
Nested: A (text-only) universe for you to explore.
Mazedude's Magical Website: My friends (horrible) site.
Jackomix: A generic personal website.
elementz: A modern-looking website that has cool things.
Chromata: A digital art tool that tries to replicate your pictures.