GNU Tools for ARM Embedded Processors is a pre-built GNU toolchain from ARM Cortex-M & Cortex-R processors (Cortex-M0/M0 /M3/M4, Cortex-R4/R5). ARM is maintaining a GNU toolchain with a GCC source branch and it releases binaries pre-built and tested from the ARM embedded branch.
Windows Public SDK is delivered as a standard Windows InstallShield package
