That's a strange question. Isn't developing software the core business of a software house?
Anyway, any answers from offshore development companies that even vaguely resemble an ad will be deleted. For the answers of Australian companies, can you open the "e-mail me" option in your account?
I am doing a market research in Australia and looking for Digital Agencies and Software houses that work on Offshore Outsourcing Model where they outsource only web or software development to any offshore companies to reduce their operational cost and focus more on their core business.
Any help would be much appreciated.