There are 2 repositories under si4463 topic.
A lightweight APRS tracker for balloons
GPS-based local relative navigation system for group of up to 6 members
A simple UHF CW beacon forked from Alexander Sholohov RA9YER github
433.925 MHz radiobeacon for http://randomrace.ru based on hc-12 board
High-performance wireless transceiver, ideal for remote control, data links, and sensor networks.
PCB and firmware for a hopelessly overengineered Si4463-based wireless doorbell
Everything on reversing the HC-12 radio serial module
P8X32A/Propeller, P2X8C4M64P/Propeller 2 driver object for the Si446x series ISM-band transceiver ICs