Hydranode Engine is a plugin-driven P2P client engine that relies heavily on Boost libraries. Hydranode codebase is licenced under GNU GPL, and is developed mainly by Alo Sarv. Currently in Beta phase, Hydranode runs on wide range of platforms, including Windows, Linux, BSD, Mac OS, Solaris etc. Hydranode Engine and plugins rely heavily on the following Boost libraries: Bind, Function, Lambda, MultiIndex, Signals, Threads, SmartPtr, Format, LexicalCast. Other Boost libraries being used include FileSystem, StringAlgo, DateTime, ProgramOptions, Spirit, Random, Tokenizer, TypeTraits, Tribool, Tuple and Any. Once Boost 1.33 is released, I'm also looking forward to using Boost.IOStreams library in Hydranode. All complex data structures in Hydranode are implemented using MultiIndex containers, which significantly reduced development time and kept code clean. Format is being used for all text formatting. Having Threads and FileSystem libraries available made cross-platform development lot easier in those areas. Homepage: http://hydranode.com/