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The Globus Toolkit (GT) has been developed since the late 1990s to support the development of serviceoriented distributed computing applications and infrastructures. Core GT components address, within a common framework,fundamental issues relating to security, resource access, resource management, data movement, resource discovery, and so forth. These components enable a broader Globus ecosystem of tools and components that build on, or interoperate with,GT functionality to provide a wide range of useful application-level functions. These tools have in t been used to develop a wide range of both Grid infrastructures and distributed applications. I summarize here the principal characteristics of the recent Web Services-based GT4 release, which provides significant improvements over previous releases in terms of robustness, performance, usability, documentation, standards compliance, and functionality. I also introduce the new dev.globus community development process, which allows a larger community to contribute to the development of Globus software.