FaceTime, Jitsi Meet, Skype, Mattermost, Google Meet, Gotalk, Whereby, BigBlueButton, Empathy, Jitsi Desktop, Booyah, Briefing, Voipbuster, Blab.im, Facewebinar, Cisco Meeting Server, cyclops.io, Firetalk, VMUX, KNCTR, Demodesk, Hubl.in, Uniteable, Highfive are some alternatives to Collabify.