Is there any way to broadcast a part of your screen as webcam on OSX (for twitch, omegle etc)?

Solution 1:

You can use OBS, also known as Open Broadcaster Software.

Here's the official site's description of OBS:

Open Broadcaster Software is free and open source software for video recording and live streaming. Supported features include:

• Encoding using H264 (x264) and AAC.
• Support for Intel Quick Sync Video (QSV) and NVENC.
• Unlimited number of scenes and sources.
• Live RTMP streaming to Twitch, YouTube, DailyMotion, Hitbox and more.
• File output to MP4 or FLV.
• GPU-based game capture for high performance game streaming.
• DirectShow capture device support (webcams, capture cards, etc).
• Windows 8 high speed monitor capture support.
• Bilinear or lanczos3 resampling.

You can download OBS for macOS 10.8+ from the official website. It also supports Windows 7/8/10 and Linux.