Developed Tools/Application Needed

I am looking for several tools/applications (online/client-server) which could be customisable for clients or could be sold online for a small fee. I am open with any type of system could be in the below categories or similar to these. Dont mention me any open source only ones which wont have any copyright issues. HelpDesk system Blogs Forums Shopping carts Project Bidding system Project Management System Real Estate Solution Social Networking SEO Tools E-commerce/Inventory System POS system Online Scheduling system CMS Please mention bid/cost for each system if possible send a link for demo. Mention the technology used and the features. I am also open for a commission basis so that when a client purchases the system you will be paid a commission let me what type of commission you would be interested in. Only serious bids and for solution you already developed. Dont bid for new development.