OpenCCM (Open CORBA Component Model) is an implementation of the CORBA Component Model (CCM) specification defined by the Object Management Group (OMG). The CCM is the first vendor neutral open standard for distributed component computing, supporting various programming languages, operating systems, networks, CORBA products, and vendors seamlessly. The CCM is the OMG's specification for creating distributed, server-side scalable, component-based, language-neutral, transactional, multi-user, secure applications. One CCM application can be deployed and run on several distributed nodes simultaneously.
QoS Enabled Distributed Objects implements a CCM and adds some more advanced features such as QoS extensions and interoperability with other middleware technologies. Please note that you also need the generator for implementing your own components, and it can be found at the same place.
Gentle.NET is a CLS-compliant, database independent object persistence framework. It has an extensive feature set, excellent performance, and reasonably complete docs. It features automatic SQL generation, object construction/caching/uniquing, validation, bindable list support, relation management, transactions, and much more. Oracle, PostgreSQL, MySQL, Firebird/InterBase, MS SQL Server (incl. CE), MS Access, SQLite, Sybase, and Sybase ASA are supported. It includes a NAnt build file as well as VS.NET project files for building under Windows. Mono 1.1.4 and higher is fully supported.
Zoidcom is a high level, UDP based game networking library for C/C++. Applications register their gameobjects with Zoidcom, and Zoidcom will manage when which object and which internal data of that object is sent to whom. It uses bitstreams as a native datatype and thus is very bandwidth efficient. Support for background file transfers, synchronization of player movement with extrapolation and client side prediction, and many other things are included.
omniEvents is a cross-platform server that enables CORBA applications to communicate through asynchronous broadcast channels (rather than direct method calls). It is a small, efficient implementation of the Object Management Group's Event Service specification designed to work with omniORB.
Mandala is a Java library which eases the development of concurrent object-oriented applications by using the concept of asynchronous references. Mandala also provides remote asynchronous references in order to create distributed applications. Mandala is dynamic in that objects do not have to be specifically written to be accessed asynchronously (and remotely).
COID is an object-oriented networking library with a tool that automatically generates a lightweight communication layer directly from a C++ class declaration. The coidgen tool automatically extracts designated classes and methods from specified header files and generates a corresponding client class and host dispatcher. The server library manages networked and local connections and provides various services to running objects. The communication layer establishes either remote connection through TCP or direct (vtable) connection between the client and the server (if they reside in the same process).