The HP webOS 3.0.5 SDK released

The HP webOS 3.0.5 SDK contains the libraries necessary to do both JavaScript development and C/C++ development. For JavaScript development, the SDK includes the command line tools needed to package, download, and debug applications, as well as sample code, reference code, and reference documentation. For C/C++ development, the SDK also includes the Plug-in Development Kit (PDK), which includes a GCC compiler, SDL and OpenGL code libraries, project templates, sample source code, scripts, utilities, documents. You will be given an opportunity to opt out of installing the PDK during the installation process.

You can install the SDK on Windows, OS X, and Ubuntu Linux host PCs. For C/C++ development, the SDK integrates with Visual Studio on Windows, and Xcode on OS X, although you can use command-line tools if you prefer. (App templates are currently only available for Xcode 3.6 and earlier.)

Link: Downloading and Installing the 3.0.5 SDK and PDK