What are some alternatives?
When comparing MLDonkey and Acqlite, you can also consider the following products
eMule - eMule is a free peer-to-peer file sharing application for Microsoft Windows.
aMule - aMule - the all-platform P2P client!
Soulseek - Soulseek® is a unique ad-free, spyware free, and just plain free file sharing application.
Fopnu - Fopnu is P2P File Sharing System. 100% Free, Simple and Easy to Use. Contains NO Spyware and NO Ads.
Shareaza - Shareaza is the most luxurious and sophisticated file sharing system you'll find.
Tixati - Tixati is a peer-to-peer file sharing program that uses the popular BitTorrent protocol.