Here is an option for small libraries who want to automate Mandarin M3. The software is free. The company does offer optional support for a fee. This looks a lot like some open source business models. Linux is free but you can purchase it from Red Hat with support and additional features. The Koha ILS is free but now there is a company offering support for a fee. Mandarin is not open source, as far as I can see, but their business model is moving that direction.