ClockWork - Web to PC clock synchronizer. Synchronizing with atomic clocks. Runs in background as system tray task or in 'normal' window. LAN and dial up supported. Many configuration options. TIME, DAYTIME and SNTP protocols supported. Online help.
The Atom Builder - Chemistry teaching software which simulates the building of any of the first 20 atoms (up to calcium) on screen. Learn how atoms are formed from electrons, protons and neutrons and how the electrons are arranged in shells or energy levels.