Hi Tracey. It's difficult to answer this without knowing more about your organisation, your budget, or the kind of training you are trying to develop. For OU courses, we do have our own in-house systems. However, the OU's Centre for Professional Learning and Development focuses on continuing professional development and bespoke commercial e-learning. If you would like to contact them to discuss your needs further, their email address is CPLDfirstname.lastname@example.org. (I know some of the team there, so please mention my name and this forum.)
Also, trade shows are a good place to see what suppliers are doing and examples of the kind of e-learning they can develop. Everyone has their favourites - some of the popular ones are Learning Technologies (Jan), HRD (April-ish), World of Learning (Nov).
Hope that helps - and good luck with your plans.