PVI-ENC4MP4-HDMI - 4 Channel HDMI Video Encoder Card Mpeg4 – Pro Video Instruments
Rocketfish™ 4-Port 4K 60Hz HDMI Switch Box Black RF-G1501 - Best Buy
4-Channel HDMI Splitter - www.argomtech.com
USB 3.0 to 4 HDMI Adapter - Quad Monitor - USB-A Display Adapters | Display & Video Adapters | StarTech.com
Plugable USB-C or USB 3.0 Quad HDMI Adapter – Plugable Technologies
Amazon.com: MT-ViKI HDMI Splitter 1 in 4 Out, 1x4 Power HDMI Splitter 4 Ports w/AC Adapter, 4Kx2K@30Hz 3D Full HD Distributor for PS4 Fire Stick HDTV : Electronics