The best alternatives to Speer are LiveKit, Signal Messenger, and MushRoom. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Speer?
AssemblyAI— Speech-to-Text API with superhuman accuracy
LiveKit is free, open source infrastructure for building and scaling real-time audio and video experiences in your applications. Use our APIs to easily build audio-only spaces, live classrooms, in-game video chat, collaborative screen sharing, and more.
Signal is a cross-platform encrypted messaging service developed by the Signal Foundation and Signal Messenger LLC. It uses the Internet to send one-to-one and group messages, which can include files, voice notes, images and videos.
Knock Knock the person whom you want to message and he/she should accept your knock Room or Group can be created by providing a name Share Room link with your friends to join the conversation Watch video or listen music during conversation