Is there a good widget plugin for chat and feed?

Question

Web development

Good afternoon. Guys, tell me if there are solutions to implement the following tasks.
There is a main page, a small widget is displayed on the left, where all visitors can correspond in the form of a conference, having previously registered on the site.
And the second task, the message feed. For example, a person writes Hello - and all visitors see the word Hello in this feed. The second writer puts his proposal in the queue until the time of the first one expires. Thus, the message is changed, according to the queue, with an interval of 15 minutes.
UPD: I found an excellent QuckChat solution for chat

Answer 1

You should look somewhere in the direction of websockets, their classic implementation manual is just such an online chat