Good WordPress FREE Chat Plugin

Hello Everyone.

I’m looking for a casual WordPress plugin, that is FREE of cost. I would also like to see unlimited people in chat, most of them have limits. I liked envolve chat, but it limits me to 25 people and hence most of the time I myself can’t chat.

Any suggestions? Or if you have any good chat plugins in mind (Facebook style of bottom bar) which asks for money, it should be under 10$

Thanks in advance!