i own a software company and my team had developed last year a web based listing management application similar to http://www.open-realty.org/. This is not just a script , it has over 10Mb, full OOP developed, easy instalation features, 7 build-in plugins, templates system support. Now I am moving all my business to e-commerce and I am interesting to sell this software , or I will release it under GPL licence. For ones of you how are interested Please PM me and I'll give you more details and access to demo.