Donations to coppermine

[EagleMark]

I have test run the Coppermine Photo Gallerey along with a few others that were offered by my web server and Coppermine won hands down. No comparison, Coppermine just does a great job!

Here's a link if anyone wants to see it.
http://eagle-mark.com/pictures/

So I have seen a spot to make a donation for this freeware. What is an appropriate amount to donate?

[Αndré]

Unfortunately we cannot decide how much is appropriate in your opinion