Trading software comes in many shapes and sizes with many options and prices. Software is offered by both On-line Brokers and Direct Access Brokers who have affiliations with Clearing Houses.
On-line Brokers typically use Web based applications which tend to be slower in their executions and are mostly processed through Market Makers. Many of these can be found in the Brokers section.
Direct Access Brokers typically provide software that you download and install on your PC. Order execution is typically through an ECN of your choise with all of your financial trades being cleared though a clearing house such as Penson Financial Services, Inc. or Southwest Securities Group, Inc. to name a few.
Many Direct Access Brokers use trading software from specialty software vendors
Direct Access Brokers