OGame Ninja Timer is a rather simple tool which will make it easier to determine the exact time when you need to send your fleet or recyclers.
From the author's website:
In OGame, there is a technique called the ninja. This requires precise timing, and I got sick of looking at my watch, or missing the right time. So, I wrote a program to time it for me.
This utility will beep for 1 minute before you need to send your fleet, 15 seconds before you need to send your recyclers and 10 seconds before the enemy fleet arrives.
The time when it tells you to send your fleets are offset. The ninja fleet is offset by the time it needs to arrive plus 10 seconds. That way, there is plenty of time for the page to load fully and have your ninja arrive a few seconds before the enemy's attacking fleet. The recycler timer is offset by it's fleet time plus 30 seconds.
It could use some work, especially on the design part, but the important thing is that it works. So if you find it usefull, go ahead and download it.