Streamlabs

Streamlabs is a free live streaming application built on top of OBS Studio's open-source engine, and it added its own guest calling feature so you can bring remote participants directly into a live stream or recording without separate software.

It's popular because it's free and familiar to anyone who's used OBS, with alerts, overlays, and scene management already built in for creators coming from a streaming background rather than a podcasting one.

The remote guest audio quality depends heavily on everyone's connection since it's optimized for live streaming rather than local high-resolution track capture, so if pristine post-production audio is the priority, a dedicated remote recording tool will usually do better.

It's a good fit if your show already streams live and you want guests folded into that same pipeline rather than running two separate tools.