Trading System Back Test Library

Hello Everyone, I want to develop a software that people can use to design/develop a mechanical trading system. I want a library that can be used for this purpose. The library should enable a programmer to write, test and optimize computerized trading systems. The functions simulate trades on historical data and provide reports to analyze the results. I want you to only point me to a company that sells such libraries. Basically to develop a charting software if you know of company that can sell library that aid in various functions e.g. scanning, pattern recognition etc then its a bonus. For e.g. a company that does something like this is Modulusfe. But I don't want you to refer to them as they now lease rather than sell solutions. To sum up: 1) Point me to a company that sell a library that I can use in my program. Users using my program can then code and develop a trading system. 2) Bonus: As I am making a charting software, point me to firms selling libraries that aids in this. For e.g. pattern recognition, scanning module etc. Since I will write my program in .net so the library should support that language. If you have any questions please feel free to pm me. Thank you.