It's a fork of the first linux *mule client, LMule, originally ported by tiku from eMule 0.26d. Based upon the wxWidgets library.
[[xMule] is knwon to be hostile to aMule and eMule, and started banning aMule and eMule >0.43x on their 1.8.4 version.
aMule is a fork of xMule.
