There are a number of great free live chat WordPress plugins available, but some of the most popular and useful ones include:

• Tawk.to: Tawk.to is a free live chat plugin that offers a wide range of features, including unlimited chats, file sharing, and screen sharing. It is also easy to use and set up.
• LiveChat: LiveChat is another free live chat plugin that offers a wide range of features, including unlimited chats, chat transcripts, and visitor monitoring. It is also easy to use and set up.
• Tidio: Tidio is a free live chat plugin that offers a variety of features, including unlimited chats, proactive chat invitations, and chatbots. It is also easy to use and set up.
• Zendesk Chat: Zendesk Chat is a free live chat plugin that offers a variety of features, including unlimited chats, chat transcripts, and visitor monitoring. It is also easy to use and set up.
• Olark: Olark is a free live chat plugin that offers a variety of features, including unlimited chats, proactive chat invitations, and chatbots. It is also easy to use and set up.

When choosing a free live chat WordPress plugin, it is important to consider your specific needs and requirements. You should also make sure to choose a plugin that is compatible with your WordPress theme and plugins.