Jami is a free open source alternative to Skype, featuring video chat, audio and messaging. You can follow the project here:
Jami is available for Android, iOS, Windows, Mac and Linux. You can get it from the official site at https://jami.net
It works peer-to-peer, so calls connect directly instead of passing through a server.
This is a brand new server run by the main developers of the project as a spin-off of mastodon.social It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!