Hello!
This is BabbleBack by goofpunk.
How to use BabbleBack
Type your messages into the chat box below, hit enter or the Send button to send your message, just like a regular messaging app. When you send your message, you'll notice that the little circles above the chat box change. That's because BabbleBack automatically cycles you to the next user. When you send another message, it will come from the currently user that color-coordinates with the currently highlighted circle. If you want to change users, either click a circle, or press Ctrl + 1 through 8 to switch to the corresponding user.
Every user has a username as well, to see the usernames, use the "Show usernames" toggle in the menu. Here, you can change the name of each user (by default, they're named by default theme color). You can also decide which side of the screen each user will appear on. Both of these settings are persistent, BabbleBack will remember them so long as you're using the same browser.
Finally, you can export your chat logs to a plain TXT file using the button in the menu, or press Ctrl + S.