vMix

vMix is a live video production and streaming software for Windows that includes its own remote guest calling feature, letting you bring in callers directly into a live switched production alongside cameras, graphics, and pre-recorded material.

It's a favorite among livestreamers and video podcast producers who need real production control: instant replay, multiple camera inputs, virtual sets, and titling, all in one app.

The feature tiers matter here, since some of the more useful capabilities like NDI support and 4K output are locked to higher-priced versions, so the entry price is misleadingly low for what most shows will actually need.

Being Windows only rules it out immediately for Mac-based production teams, which is worth checking before you get attached to the feature list.