If I want to start a Forex or Stocks dealing business, any place to develove such software? -

The legalities aside... Regarding FOREX, you can certainly hire programmers and create software from scratch, but you might be better off using a white label program from an existing forex company. They offered canned software that can be customized to your needs. Try http://www.currenex.com/index.html, http://www.ac-markets.com/partnership/wh... You can search on white label forex software to find more of them.