eMule is a filesharing client which is based on the eDonkey2000 network, but offers more features than the standard eDonkey client, because it's opensource but under the restrictions of the GPL License.
Download: eMule 0.42g (List of mirrors)
View: eMule homepage
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Jeez that was quick.
It's a "hotfix"
This bug caused crashes on some systems when viewing the transfer screen.
No need to update if you don't experience the crash.