BidOnn is an open source script Licensed under GPL (General Public License) Published by free software foundation. Bidonn is a free reverse auction script and can be customized easily based on your needs and industry niche.Anyone can run a professional reverse bidding services website in business verticals using Bidonn. It has all the necessary features of a bidding website and the site holder can earn money from the subscription fees for the services you provide to users of the website. Owners can post jobs and can choose the best bid from among multiple competing bids from employees.