I just started working with a semi-automatic trading system called
Two Percent Daily. It trades GBPUSD on an M15 chart. The system includes the
indicator 
dyn_s_r (Dynamic Fib S/R I think, I can't find the source code on the Internet) and the
Swiss Army EA. Both of these components are freely available and the source code is included.
This is a scalping system. Risk is never more than 2% per trade and you never have more than one trade open. The
indicator 
plots levels of support and
resistance 
. A trade is entered on a breakout of support or
resistance 
.
The author recommends to trade this system from the opening of the London session (8:00am GMT) to 3:00pm GMT. The two wins I had today were from about 1:30-2:00pm GMT). This also means that if I want to catch the London open, I will have to get up for 3:00am my time...yuck.
The trade entry is manual or semi-automatic if you place pending orders. The
indicator 
is easy to read and the entry instructions are clear (not absolutely objective but close).
Once the trade is in progress, the Swiss Army EA manages the exit according to one of four trading profiles (implemented as
set files). I chose the super conservative profile with a hard 10 pip stop and a 3 pip trailing stop.
I started trading this system this morning and within half an hour, I made my 2% with two winning trades in a row. The author teaches not to over trade. Once I make my 2%, I stop trading.
The plan is to trade this on a demo account for about three months and get to know the system and the GBPUSD pair at it's busiest time before I go to a live account.
Link:
http://www.myfxbook.com/members/rsmereka/two-percent-daily/47235
Note that when I re-generated this demo account, I neglected to write down the master password and the investor password so the MyFXBook stats cannot be verified.
Rick