The European Middleware Initiative brings together the major European middleware providers to deliver a consolidated set of services that will provide the European and global research communities with unprecedented computing power.
 
EMI components are deployed in the european Distributed Computing Infrastructures, in particular EGI and PRACE. The project will extend the interoperability between grids and other computing infrastructures, strengthen the reliability of services, and solidify a model of comprehensive middleware services for all user communities.
 
EMI will work to lower the technological barriers still preventing resource owners from federating resources, and research communities from using grids as a commodity tool in their activities. It will focus on improving usability and accessibility for scientific users and interoperability and manageability for service providers.

the Advanced Resource Connector (ARC) middleware provides a set of reliable, robust, non-intrusive and well-tested core services. KnowARC aims to significantly increase awareness and usage of the next-generation ARC middleware. The resulting high-performance Grid solution will increase productivity in many areas by enabling distributed communities and increasing the usability of existing computing resources. ARC can support everything from simple collaboration to intensive computational, since it is powerful and efficient, yet simple to deploy, maintain and use.

(pronounced "gee-lite") is the next generation middleware for grid computing. Born from the collaborative efforts of more than 80 people in 12 different academic and industrial research centers as part of the EGEE Project, gLite provides a framework for building grid applications tapping into the power of distributed computing and storage resources across the Internet.

UNICORE (Uniform Interface to Computing Resources) offers a ready-to-run Grid system including client and server software. UNICORE makes distributed computing and data resources available in a seamless and secure way in intranets and the internet.