riscos.info has for a while now had a Continuous Integration web service. This enables us to repeatedly build RISC OS software, to shake out build system bugs and automatically port the latest software from other platforms.
While the service remains a work in progress and somewhat experimental, we have written an outline of what it does which can be found on the Continuous Integration page.
The service also allows you to download bleeding-edge untested software direct from the build system.
If this might be useful for your project, do get in touch. Please email the GCCSDK mailing list for more info.