I read this and my first thought that comes to mind is..
this person knows absolutely nothing about this subject area, or sits so high on the fence it must be hard to walk
there isn't one iota of information that could be used to begin a journey on building or trading an algorithm
in a nutshell its "build your own" or "your broker will have one", or you can get 3rd parties
3rd parties, name a couple?
the article doesn't expand on these simple starting points to make me think he really doesn't know