http://kippenjungle.nl/Overzicht.htm#kipcalculator
There are some different versions of this one. I'm used to this version. The main way to learn to use it is to play with it. There are many differnt levels you can take it.
An easy way to start with this version. Where it says "Choose Color" in English, select from the list for a rooster and a hen. For practice choose a "Red" rooster and "Barred, Cuckoo" hen.
Then hit "To Chicken Calculator" on the right. An second screen will open. Go down to where it says "Calculate Crossing" and hit that. You will see your results, a barred rooster and a black hen. You just made a black sex link.
Then go down to "Continue with this male" and "Continue with this female" and select those. Then hit "Calculate Crossing" to see what those options are. You should now be addicted and amazed at what you could get.
You can also go where it lists the different genes and change those to see what differences they make. I'm talking abotu where you see E, Co, Db and all those.
There is a write-up down below telling you how to do it and some links that can help a lot.
Remember that these are generic, general results. They do not show leakage and other things. For example, in my example, the black sex link hen is shown as solid black. In reality, with this cross, you often get red or gold leakage around the neck. That does not show up here