The open source project DC client framework jDCBot (http://jdcbot.sourceforge.net) I have been working on is now nearing its 1.0 milestone. Version 1.0 means that it will have all the required features that a DC client framework should have, like – managing shared files, hashing them, creating file lists, queuing downloads and resuming them when the source is available, multi-source downloading, etc.
This framework has been created from scratch, so unlike other DC clients which share DC++‘s code for the core functionality and hence provide similar features, jDCBot will provided unorthodox features. For example DC++ clients and its derivatives allow users only to provide different user names and passwords for different hubs. jDCBot on the other hand allows you to be passive or active in different hubs. So you can be passive and active both at the same time. This is useful in situations when say you are inside your college LAN and you want to connect to hubs inside the LAN and outside on the Internet too. In this case DC++ and derivatives will force you to be passive, but in jDCBot you can be active for inside your LAN and passive for outside the LAN. Well, you also get to set different descriptions, email addresses and connection types too.
There some other cool features too which are not present in other clients like allowing you to set different upload speeds for different users (this way you can give your friends a boost), blocking upload to particular users (could be misused but we are giving the power and it is upto the clients who will use jDCBot to make the decisions), using the virtual file list concept which allows the users to organize their share into virtual directories without actually reorganizing the files, the file names in file list can even be different from the original allowing the user to rename the file in the file list without rehashing or allowing the user to re-associate the virtual file with the actual file after the original file name/path changes so that rehashing is not required, and many more. Last but not the least it is pure JAVA framework and hence is platform independent and is very modular.