GNUnet is a peer-to-peer framework with focus on providing security. All peer-to-peer messages in the network are confidential and authenticated. The framework provides a transport abstraction layer and can currently encapsulate the network traffic in UDP, TCP, HTTP, HTTPS, or direct 802.11 (WLAN). GNUnet supports accounting to provide contributing nodes with better service. The services built on top of the framework include anonymous file sharing and a virtual network providing IPv4-IPv6 transition via protocol translation over the P2P network.
Crispy is a lightweight Java API to invoke remote services (RMI, CORBA, WebService, XML-RPC, EJB, Hessian, Burlap, REST, JBoss Remoting, or others) with simple Java object calls. You can integrate Crispy in a service oriented architecture (SOA), in a rich client platform (RCP), or in an inversion of control container (IoC) such as PicoContainer, SpringFramework, or HiveMind.
Libev is a high-performance event loop for C (with optional and separate interfaces for C++ and Perl), featuring support for I/O, timers (relative and absolute, cron-like ones), signals, process status changes, and other types of events. It has both a fast native API and libevent emulation to support programs written using the libevent API. Differences to libevent include higher speed, simpler design, more features, less memory usage, embedability, and no arbitrary limits. libev supports epoll, kqueue, Solaris event ports, poll, and select.
PSIworld (Programmable Scalable Interactive World) is a framework that provides a set of libraries, utilities, and applications to ease the implementation of dynamic artificial intelligence environments. Specifically, the development of multi-agent applications is targeted. It is designed in a generic manner so that various kinds of applications can use it. This framework not only includes pure algorithm libraries for AI computation tasks, but also a C/C++ library for distributed computation. A server-client model also involves various, concurrent visualization methods of distinct Agents or Societies.
OpenFWTK is an application proxy toolkit which inherits the ideology of TIS fwtk and maintains API backwards compatibility. The design goal is to make it simple yet powerful; no performance hacks are allowed in the code and library dependencies are reduced to a minimum. It is a true application layer filter. It features unified pluggable content inspection for the most frequently used protocols, NAC (Network Admission Control), and the ability to define fine-grained Internet access policy based on browser identification.
The PEAK library tries to achieve high performance in combining multi-threading with an efficient I/O event model. You can write event-based applications that use massive sockets I/O, timers, and signals. Its underlying I/O multiplexing engine supports kqueue(2) (FreeBSD, NetBSD, and Mac OS X), epoll(2) (Linux 2.6), and /dev/poll (Solaris). It provides support for optimized memory allocations, basic database primitives, and synchronization.
IMC (Implementing Mobile Calculi) is a Java framework for implementing distributed applications possibly with code mobility. The name is due to the fact that this framework was originally built to help implement the run-time system of a mobile calculi implementation, i.e., calculi accessing remote resources and nodes, and, possibly, exchanging code, processes, and mobile agents. If you don't need code mobility features, you can simply ignore them and use IMC for building any distributed and network application.
Channel is a C++ template framework for distributed message passing and event dispatching. Its major components (message IDs, routing algorithms...) are highly configurable as template parameters. As a namespace shared by peer threads, channels support publish/subscribe scope control, message filtering, and translation.