Xcode 3.0 is the Mac OS X 10.5 (Leopard) developer tool set, including the Xcode IDE, Dashcode, Instruments, Interface Builder 3, and the rest of the developer tools. Xcode 3 defaults to install in /Developer, but on Leopard you may now install the tools in a location of your choice; see the release notes for details.

Xcode 2.5 is a minor update to the Tiger tools that is functionally similar to Xcode 2.4.1. It is not considered a critical update. Xcode 2.5 for the first time supports development hosted on Tiger as well as Mac OS X 10.5 (Leopard). This release is recommended for developers needing to continue to use the Tiger tools while running Leopard, and serves as a transition to Xcode 3.0. On Tiger systems Xcode 2.5 will upgrade previous versions of Xcode; on Leopard systems Xcode 2.5 will install along side Xcode 3.0. Xcode 2.5 does not support developing for the Leopard SDK or Leopard-specific features. Please read the release notes for installation details.

WebObjects 5.4.1 is an update release for the version of WebObjects included in the Mac OS X Leopard tools. This release fixes several bugs in areas such as web services serialization, deployment tools, and database compatibility, among others. This update can be installed on Mac OS X 10.5 Leopard.

The Computer Hardware Understanding Developer Tools (CHUD Tools) are designed to help hardware and software developers measure and optimize the performance of Macintosh systems. They require Mac OS X 10.4 or later.