Add to ORKGAmong existing grid middleware approaches, one simple, powerful, and flexible approach consists of using servers available in different administrative domains through the classic client-server or Remote Procedure Call (RPC) paradigm. Network Enabled Servers (NES) implement this model also called GridRPC. Clients submit computation requests to a scheduler whose goal is to find a server available on the grid using some performance metric. The aim of this paper is to give an overview of a NES middleware developed in the GRAAL team called DIET and to describe recent developments around plugin schedulers, workflow management, and tools. DIET (Distributed Interactive Engineering Toolbox) is a hierarchical set of components used for the developmen...