Some useful free apps:
This will synchronise your PC at regular intervals to exact time. (I set mine to NPL’s time server and every 15 minutes) but if you are not in the UK you might want to use your country’s national time standard.
NetTime – Network Time Synchronization Tool
This is where the LED clock application comes from, it is freeware from Germany
ProppFrexx ONAIR Time (Free) is the clock, there is also a good bit of software for editing metadata in audio files (the Tagger)
ProppFrexx ONAIR – The Playout and Broadcast Automation Solution