2Checkout: instant credit card processing services accounts for merchants with internet businesses. (2Checkout.com, Inc. Service)
AlertPay: Canadian payment system enabling any business or consumer with email to send and receive internet payments securely, quickly and cost-effectively. (AlertPay Inc. Service)
Clickbank: very popular payment solution if you're selling a digital, downloadable product. Huge in-built affiliate network. (Click Sales Inc., Service)
e-gold: internet payments system 100% backed by gold. (e-gold Ltd. Service)
Firepay: UK based person-to-person payment system. (FirePay UK Ltd. Service)
moneybookers.com: enables any business or consumer with an email address to securely and cost-effectively send and receive payments online. (Moneybookers Ltd. Service)
Nochex: leading independent UK based online payment company, specialising in providing smaller online businesses with easy to use online payment services. (Nochex Ltd. Service)
PayPal: probably the industry leader. One in three online buyers in the US has a PayPal account, and over 58,000 users worldwide sign up for PayPal each day. (PayPal Inc. Service)
Stratocash: allows merchants to accept over 20 methods of payment other than credit cards. (Strategic Payments, Inc. Service)
SWREG: e-commerce solution tailored to the downloadable software/shareware market. (Digital River, Inc. Service)
Merchant accounts
CyberAuthorize: offers merchant accounts, real time payment processing, mobile payment solutions and electronic check solutions. (CyberAuthorize.com LLC., Service)
PowerPay: internet based credit card processing and merchant accounts. (PowerPay LLC. Service)
Protx: provides secure online credit card and debit card payment solutions for thousands of online and mail order businesses across the UK. (Protx Ltd. Service)
QuickPayPro: a fast, easy way to automate your credit card processing, follow-up marketing and affiliate program. (QuickPayPro, LLC Service)
WorldPay: accept payments online, by phone, fax or mail, all through one merchant account and one payment processing system. (WorldPay Ltd. Service)
Misc.
CB Switch: software automatically replaces Clickbank payment links with any alternative service provider if Clickbank system is down. (Adrian Ling. Software)