RetroShare is a open source cross-platform, private and secure decentralized communication system. It lets you to securely chat, share photos, videos, and more, using OpenPGP to authenticate peers and .
DC++ is an open source client for Windows for the Direct Connect protocol. Direct Connect allows you to share files over the internet without restrictions or limits. The client is completely free of advertisements and has a nice, easy to use interface. Firewall and router suppor.
FlylinkDC++ is a free and open-source, peer-to-peer file-sharing client that can be used to connect to the Direct Connect network or to the ADC protocol. Is derived from the client DC++ and is based on the source code ApexDC + + 0.4.
EiskaltDC++ is a program for UNIX-like systems that uses the Direct Connect and ADC protocol. It is compatible with other DC clients, such as the original DC from Neomodus, DC++ and derivatives. EiskaltDC++ also interoperates with all common DC hub software.
StrongDC++ is a client for sharing files in Direct Connect network by using NMDC and ADC protocols. 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.
LinuxDC++ is a port of DC++ direct connect client to Linux. Or, to any POSIX-compliant Unix really, but since the Unix developers have access to is Linux this is the only one supported at the moment.Discontinued
The project seems to be abandoned. Last version, 1.1.0, released in April 2011, can be still downloaded from Launchpad