There are 2 repositories under fm-transmitter topic.
Raspberry Pi FM transmitter that plays music forever from the local filesystem.
FM Transceivers tools box.
diy a fm transmitter at home
A simple script for FM radio transmission using a Raspberry Pi and its GPIO pins
Various Stereo Tool Settings (ZWFM MPX-IP Stack)
FM Transmiter using an AD9833 and a STM32F103
SigintOS with RTL-SDR and HackRF demos
i organized all what i can from (https://www.instructables.com/RF-433-MHZ-Raspberry-Pi/)
Play a random laugh track on a random moment on the Raspberry PI. The audio can be played through the 3.5mm jack or be transmitted over FM.
Minimalist CLI for streaming audio over FM from a Raspberry Pi: WAV files or live from a microphone.