There are quite a few online casinos that offer free sign-up bonuses. These bonuses can come in different forms, such as free spins, no deposit bonuses, or matched bonuses on your first deposit. Here are a few popular ones you might want to check out:
1. **888 Casino**: Often offers a no deposit bonus for new sign-ups.
2. **LeoVegas**: Known for its free spins and no deposit bonuses.
3. **Betway Casino**: Frequently provides matched deposit bonuses for new players.
4. **Royal Panda**: Sometimes offers free spins or no deposit bonuses upon registration.
Always make sure to read the terms and conditions associated with these bonuses, as there can be wagering requirements or restrictions on which games you can use the bonus on. Happy gaming!