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Paypal is widely used for online payments, since it is  accepted by a large number of merchants in a number of countries. A Paypal business , premier or personal account can be opened for free . However fees are deducted from the payment received for a business or premier account.

A number of options are available for integrating Paypal with an existing website.  The simplest is using the standard Paypal  buy now or subscribe buttons. These can be created from the user control panel by filling a few parameters.  To ensure that these are not tampered, the encrypted code should be used on the website.

OSCommerce (www.oscommerce. com) is a free ecommerce solution, available under the GNU public license.  Uses PHP/mySQL , has many features needed for upgrade and the software is constantly upgraded. It has an active developer and support forum.

Zencart is based on OSCommerce and overcomes many of its limitations.

Perl : Interchange, not very reliable

ASP :  VP-ASP or Comersus

ASP.NET : AspDotNetStorefront ( www.aspdotnetstorefront. com) , complete source code is available to the buyer who can modify it as required

Paypal shopping cart : free , but a fee is deducted for every payment received by a Paypal business or premier account

For Ecommerce website design, there are many ready made free software available as well as paid solutions. For free open source software, the developers do not offer much support , but if the software is widely used, support is available through forums and mailing lists. Shareware or paid  solutions offer a free trial period but can be expensive. They usually provide support by email or over phone.

Even if an open source solution is used, some amount of customisation is needed for all ecommerce  websites. If the website owner is familiar with web design and programming, this may be simple.  If the website owner does not have enough time or is unable to learn how to make the modifications, a programmer may have to be hired and the expenses involved can be significant.

Some popular free shopping cart software are:
1. Zencart
2. Oscommerce
3. Agora
Free templates are also available with this software. 

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