Freeware GUI for Windows Time Service configuration, allowing full control of time sync graphically but still using the Windows sync tools (unlike many tools that do the clock sync and set your clock directly). Works with Windows XP/2003/Vista/2008 32-bit and 64-bit.
"Simple Network Tester's agents run on PCs located at key locations. You command them to send live test data through your network when you need it. Run tests from your office using Simple Network Tester's user-friendly web pages. Monitor the health of your network just by clicking a few links." Tests jitter to simulate VoIP calls and has a free command-line version to download. $29 per company after 15-day trial.