title: Where can i download some good software design document?
body: <p>Right now i am designing a software, and i need some good documents for reference.</p>
  
  <p>Where can i download some good system design or UI design documents ?
  by the way, i don't want just some document template.</p>
  
  <p>Thanks in advance!</p>
  
  <p>Regards,</p>