StrongDC++ is a client for sharing files in Direct Connect network. It is modification of program DC++ and it brings many news and features from other modification. Since DC++ is developed under GNU/GPL, you can download source and modify it....
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Support for Strong DC++ is available from the
publisher/developer site 
This download (Strong DC++) is freeware. "Freeware is copyrighted computer software which is made available for use free of charge, for an unlimited time, as opposed to shareware where the user is required to pay (e.g. after some trial period or for additional functionality)." More info at
Wikipedia.
Soft32 (ITNT) cannot be held liable for issues that arise from the download or use of these software products. We encourage you to determine whether this software or your intended use is legal. Even if we try to check the program files for viruses, we cannot guarantee 100% that they are clean. For your own protection always check downloaded files for viruses, spyware and malware.