Best free messaging apps

The first app you can talk to others and it doesn't use your text from your plan. The other plan is like when you want to have a meeting you can talk to everyone at a once but it uses your text from your plan. The last one is where it is like the one where you can have a meeting but it doesn't use your text plan. They are all free. I don't think I would like these because I don't have one of those phones and  I think it is lame.