There are quite a few great free slot games you can play online! Some popular options include:
1. **Starburst** - Known for its vibrant colors and simple gameplay.
2. **Gonzo's Quest** - Features an adventurous theme with cascading reels.
3. **Cleopatra** - A classic slot with an ancient Egyptian theme.
4. **Book of Ra** - Another Egyptian-themed slot that's quite popular.
5. **Mega Joker** - A retro-style slot with a progressive jackpot.
You can find these games on various online casino sites that offer free versions, like Slotomania, House of Fun, or directly on the developers' websites like NetEnt or Novomatic. Enjoy spinning those reels!