In the alternative, you can just click on any of the links at the bottom of this page to make your own selection of provider and client.

Wo alternative is to use matrix.org as provider and use the Element client. To do that, click on a link and, when prompted, select the Element client and follow the instructions for installing it. The end result will be that you will have a free account with matrix.org and you will be able to immediately join and enter the "room" that you selected when you clicked a link on this page.