With Bleep you can send text and voice messages in a private manner. It's an instant messaging service that isn't centralized, but works via P2P instead.
P2P instant messaging client.
What makes Bleep so special?
With this app you can get in touch with whoever you want with the certainty that nobody will be able to spy your private conversations. To use Bleep you can sign up by email, with a phone number or creating an incognito account. Therefore, it's a secure and private communications option.
You can use Bleep via Wi-Fi or making use of your data plan, but the first option is highly recommendable if you want to put a cap to the consumption of your data plan.