Here is another article explaining some useful concept for your harmonic pattern trading. Of course, this is free article to improve your harmonic pattern trading.
In addition, you can also have an access to important free articles for your trading here.
Harmonic Pattern Plus (and also Harmonic Pattern Scenario Planner) is the repainting but non lagging Harmonic Pattern Scanner. You can get them for the affordable price. Below is links for them.
X3 Chart Pattern Scanner is non repainting and non lagging Harmonic Pattern and X3 pattern Scanner. Below is links for them.