CubeCart is an eCommerce script written with PHP & MySQL. With CubeCart you can setup a powerful online store as long as you have hosting supporting PHP and one MySQL database. - 
CubeCart eCommerce

Zen Cartâ„¢ truly is the art of e-commerce; a free, user-friendly, open source shopping cart system. The software is being developed by group of like-minded shop owners, programmers, designers, and consultants that think e-commerce could be and should be done differently. Some "solutions" seem to be complicated programming exercises instead of responding to users' needs, Zen Cartâ„¢ puts the merchants and shoppers requirements first. Similarly, other programs are nearly impossible to install and use without an IT degree, Zen Cartâ„¢ can be installed and set-up by anyone with the most basic web site building and computer skills. - 
Zen Cart

A big name payment merchant. If you are tired of Paypal, you might want to take a good look at what Digital River is offering. They have different solutions for different sectors. Check out their e-commerce, e-marketing and global payment platforms, which enables their clients to make full use of their services. If you are a software or game developer or you are dealing with consumer electronics, they have specialized solutions to help increase sales and profit. Well, that is their claim. Furthermore, their reliable data centers ensures that their system has a 99.7% uptime and can transact in more than 20 different currencies. Their data centers are located throughout the world to ensure redundancy. Oh, it seems that they have many big name corporations like Kodak and Adobe as their clients as well.

Mission ECommerce is a Phoenix Arizona based web design & marketing firm. MissonE has won 9 Golden Web Awards for our creative skills including the DBI best practices award for our detailed approach to web development projects. - 
Phoenix Arizona Web Design Firm

Sourcio offers a wide range of IT services and open source solutions for small and medium-size businesses. Enterprise solutions such as CRM (Customer Relationship Management), EMR (Electronic Medical Records), Content Management System (CMS), and e-Commerce are often too expensive for small and midsize businesses, and organizations. As a result their business processes lack automation and efficiency. Open source solutions allow small and midsize enterprises to acquire software solutions at a fraction of the cost of their commercial counterparts. - 
Sourcio CJSC

Robust Open Source Shopping Cart Software for a complete online e-commerce store. This fully supported and customizable application includes Shipping, Payment, Newsletter & Gift Voucher tools. Allows users to set Admin Access Levels, add Multiple Product Images, reduce fraud with Order Status control and much more. CRE Loaded(TM) has over 100,000 installations and many templates designs available. Active forums & freelance development community. - 
CRE Loaded

BPAY enables you to pay just about all your Australian bills in one go, anywhere, anytime. Just pick up a phone or jump on the internet. You can choose the account you wish to pay from or even schedule future payments and forget about them. - 
Bpay

Sell your downloads. This is a commercial site especially catered to selling digital downloads on the Internet. Unlike most other online retailers, you will not find toys, physical gifts or fashion here. It is all digital. A great place for software developers, computer game programmers and even photographers to sell their wares. Even authors of e-books can easily and quickly sell their product. If you have photos, games, software, ebooks, audio music, sounds, scripts, reseller rights and so on, you have come to the best place to promote your product. There is no longer a need to get a distributor or those expensive middleman to peddle your wares.

RegOnline enables you to process event registrations and credit card payments online for your meetings and events. There is no software to purchase or install - you can access RegOnline's online registration software from any web browser. - 
RegOnline

Merchant Account Services offers free information to merchants about establishing a merchant account and ecommerce through articles, blog posts, forums, and tools. - 
Merchant Account Services

NetCreativeMind offshore outsource Indian leading bpo company provides Indian BPO Services, bpo services india, bpo service Company india and BPO service world wide at affodable price. We also provide other services customer support, technical support and Live chat support etc. - 
Net Creative Mind

Internet marketing center where you can learn internet marketing techniques from internet marketing expert Sean Mize. Offering invaluable advice that will bring you high traffic and help you convert them to high paying clients. - 
Secrets Internet Success

We are a product development company with immense experience in the entire software life cycle of software product and custom application development. We are a UK registered company based in London, UK. We will help you to succeed in your online business by giving you the right product and by being with you, helping you, mentoring and training you in every step to make your online business a huge success. Our focus is and always will be to help you “to sell More online and to improve your financial bottom line” - 
Palindrome Software Labs Ltd