Yes, my favorite is the Friendship Chat. You might have already heard of it!
This is a chat room for any age! You don't need to have a personal account, all you need is the JAVA download. It's easy to download java-doesn't take much time. Then, you get to the start page. Just enter a nickname and create a password. As far as I know, they don't really save the password. You can log-in any time you want to with different names! It's fun and safe.