An SNTP client daemon for machines without a sane system time

IPTimeSync is a Python program that automatically adjusts system time based on IP location. It supports HTTP and SOCKS5 proxies and can operate without a proxy if needed.

stimesync - Simple SNTP atomic clock time sync GUI app for Windows.

Sync spent time entries in youtrack according to the working time you keep in an Excel sheet.

Program to sync the time with different (preset) servers and also a custom server function. Written for Debian GNU/Linux and systems they based on it.

An Arduino library for synchronizing time between two Arduino's using a variety of different types of connections including LoRa, I2C, SPI and Serial.

Android app demonstrating precise time synchronization with several smartphone IMUs

Wojciech's ptpd workspace

UAV GNSS navigation module with RTK capability.

A go application to play the same music on multiple devices at (exactly) the same time.

Set and get the time on various Bluetooth Low Energy clocks

Sync worklogs between multiple time trackers, invoicing, and bookkeeping software.

A Roughtime secure time sync client and server written in Rust