What are some alternatives?
When comparing YakYak and Jitsi, you can also consider the following products
Wire - Private & Secure Messenger
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Pidgin - Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once.
Empathy - Apps/Empathy - GNOME Wiki!