There are 1 repository under onewire-slaves topic.
How to tell original from fake DS18B20 temperature sensors.
OneWire slave device emulator
An arduino library to communicate using the Dallas one-wire protocol, where the Arduino takes the role of a slave. Entirely implemented using interrupts, you can perform other tasks while communication is handled in background.
NTC thermistor to 1-Wire converter on Arduino Nano
DS1993 ibutton Emulator using Arduino