Browser-Based Games Like IMVU (No Download)

True "no-download" 3D avatar chat is rare (WebGL/Unity WebGL limits). Closest **browser-playable** social worlds:

Browser / WebGL (Zero Install)

• Habbo Hotel: **Unity WebGL** — runs in browser. Pixel art hotel, rooms, pets, trading. Teen/Young Adult.
• Club Cooee: **Browser (WebGL)** 3D chat, avatars, rooms, parties. Free.
• Woozworld: **Browser (Unity)** — Tween/Teen, fashion, quests, housing.
• IMVU Next (Web Beta): IMVU's own 3D web client in beta. Check imvu.com.

Lightweight Download (Tiny Client)

• Gaia Online: HTML5 avatar dress-up + forums. No 3D world.
• Rec Room (WebGL Beta): Cross-platform social VR/flat. Growing.

Dead/Closed

• SmallWorlds (was best browser 3D MMO).
• OurWorld (closed 2021).
• Second Life / VRChat: Require download (no full browser client).

Discord + Web Games

Not a world, but: **Discord Activities** (Watch Together, Poker Night, Chess, Sketch Heads) + custom avatar/profile = lightweight social gaming in browser/app.

Best Bet: **Habbo** or **Club Cooee** for instant 3D browser avatar chat. **IMVU Web** if you want IMVU specifically.