There are 2 repositories under split-flap-display topic.
Open Source Mechanical Split Flap Display, AKA Solari display
Code and documentation for SBB split flap displays
A JavaScript plugin for creating a tickerboard effect. Plugin for React or vanilla JS.
Script for fetching YouTube statistics from the API and sending them to a split-flap display
Software to controll SBB FallBlatt via RS485
Airframes Solari Board
Fallblattanzeige der Deutschen Bahn (Leiterplattenlayout)
p44sbbd is a free (opensource, GPLv3) daemon for controlling Swiss Railway (SBB) electromechanical display modules (Fallblattanzeigen) via a RS485 serial interface.
ESP32-Mikrocontrollercode zur Ansteuerung von Fallblattanzeigen
Information on Solari split flaps and their operation
Fallblattanzeige der S-Bahn Berlin (Leiterplattenlayout)
Documentation of the clackotron project
PlatformIO and Arduino/ESP32 based firmware for the clackotron project
KiCAD hardware schematic and layout files for the clackotron project
Svelte.js based webinterface for the clackotron project