Al Basel Cart is an E-Commerce solution forked from the popular OpenCart software.
It has order management and multiple payment gateways already built in and a lot of other features, such as:

• Unlimited Categories
• Unlimited Products
• Unlimited Manufacturers
• Templatable
• Multi-Language
• Multi-Currency
• Product Reviews
• Product Ratings
• Downloadable Products
• PCI Compliant
• Automatic Image Resizing
• Multiple Tax Rates
• Related Products
• Unlimited Information Pages
• Shipping Weight Calculation
• Discount Coupon System
• Search Engine Optimization (SEO)
• Unlimited Module Instance System
• Backup & Restore Tools
• Printable Invoices
• Sales Reports

The administrator control panel is full of features and allows you to modify everything in the website without needing any professional help.