Chatzy is described as 'free private chat service which you can use to communicate with people you already know or people who visits your blog or website. With Chatzy you can create a chatroom and send out email invitations very quickly and easily. No registration is required' and is a Instant Messenger in the Social & Communications category. There are more than 50 alternatives to Chatzy, not only websites but also apps for a variety of platforms, including Android, Windows, iPhone and Mac. The best alternative is Jitsi, which is both free and Open Source. Other great sites and apps similar to Chatzy are Wire (Free Personal, Open Source), WhatsApp (Free), Hangouts (Free) and Zulip (Free Personal, Open Source).
Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, GTalk/Hangouts extensions, as well as OTR, ZRTP, etc.
Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most secure end-to-end-encryption. Why Wire?
WhatsApp is an iPhone and Android messaging app which allows you to exchange messages without having to pay for SMS. In addition to basic messaging WhatsApp users can create groups, send each other unlimited images, video and audio media messages.
With Viber, everyone in the world can connect. Freely. More than 460 million Viber users text, make HD-quality phone and video calls, and send photo and video messages worldwide over WiFi or 3G - for free.
Trillian is an instant messaging app that works on phones, tablets, and desktops while keeping your chats neatly synchronized between all of them! We think conversation should be easily shared between all of your devices, not trapped as text messages on your phone.