Editors' Note: You will be taken to a third-party site to complete your download. Using P2P and file-sharing software to distribute copyrighted material without authorization is illegal in the United States and many other countries. CBS Interactive does not encourage or condone the illegal duplication or distribution of copyrighted content.
StrongDC++ is a client for downloading files in Direct Connect network. It's based on CZDC++, which is made by PPK, and contains a lot of interesting features. Since DC++ has been released as Open Source, you can download a source code and edit it.