recently I created a java class " Custom Layout Manager ", which I want to make it open-source and distribute it. So it's not really a "product", nor a "complete program".

Here's the list of permissions and specifications:

• You are free to use and modify with some limitations (packages and classes names, should remain the same, if you want another name, extend this class. - The .jar file, project name is ok to change).
• You don't need to share your modifications.
• You can't modify and then sell it to others.
• You can use it as part of your commercial software
  (For example:
  It's OK if: you created an instant messaging program, that uses my "Layout", since your "core bussiness" isn't the "Layout", but the msg program.
  It's NOT OK if: you created another "Layout" by extending it, added some features and sell it.)
• You can't remove the author's name nor the author's website address.
• You are free to donate. :D

Basically, it's free and it's Ok as you give me credits and don't make money with it.
I guess it might be a little bit complex, since you use it "commercially" but cannot sell it separately.

I have seeked almost all the licenses, and the closest one was MIT license, but it says that you can sell it, so I don't really want to use this one.

Is there any license that fits all these permissions I stated?

Thanks.