Downtimed : A program that monitors operating system downtime, uptime, shutdowns, and crashes and records any findings

Downtimed is a program that monitors operating system downtime, uptime, shutdowns, and crashes and records any findings either to the system log or to a separately specified log file. At OS startup it logs information about previous downtime. It then periodically updates a time stamp file on the disk, which is used to determine the approximate time when the system was last up and running. During a graceful system shutdown, it records a time stamp in another file.

• Licenses : BSD Revised
• Operating Systems : Linux, FreeBSD, BSD
• Implementation : C

The Network Time Protocol (NTP) : Used to synchronize the time of a computer client or server to another server or reference time source

The Network Time Protocol (NTP) is used to synchronize the time of a computer client or server to another server or reference time source, such as a radio or satellite receiver or modem. It provides client accuracies typically within a millisecond on LANs and up to a few tens of milliseconds on WANs relative to a primary server synchronized to Coordinated Universal Time (UTC) via a Global Positioning Service (GPS) receiver, for example.

• Licenses : Open Software
• Implementation : C