OpenBroadcaster might be a bit more popular than Serato DJ. We know about 1 link to it since March 2021 and only 1 link to Serato DJ. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Also, for software/hardware check out Native Instrument's Traktor Pro 3 and SeratoDJ. Source: about 2 years ago
Just came across this which could help you. Source: almost 3 years ago
Mixxx - The most powerful free DJ software in the world.
AzuraCast - AzuraCast is a free and open-source self-hosted "web radio station in a box".
VirtualDJ - Virtual DJ Software - MP3 and Video mix software for DJs
LibreTime - LibreTime is a community driven fork of SourceFabric's Airtime.
Traktor Pro - Flagship DJ software with four decks and a stunning range of creative features for maximum freedom in DJing.
Centova Cast - Centova Cast is the world's most advanced Internet radio stream hosting control panel.