Hi folks, this is where I am at todate.
TOPCAT : FlightSimSoft.com
(payware, bit expensive)
TAKEOFF PERFORMANCE CALC : flightsim.to/file/11740/takeoff-landing-performance-calculator-a320
(freeware, this is an Excel spreadsheet)
TAKEOFF PERFORMANCE CALC: https://www.fstools.tech/
(freeware, broken and no longer works for Runway, probably will not be fixed)
AIRPLANE TOOL BOX : VAS Airplane Toolbox - Utilities - X-Plane.Org Forum
(freeware, web based, clean interface)
PERFCALC : Performance Calculation for AIRBUS
(freeware, web based, clean interface)
Please note: I have entered the exact same settings in all of these applications and the output varies quite a bit. I am kinda leaning towards PerfCalc due to getting the THS setting provided. We will all have to wait for a good definitive one to come our way. Would be excellent if this could be developed by FBW right in the EFB.