Well you can use HCFR which is free, but your better off imho using Chromapure or Calman 5. All options will require you have a meter though.
The one software that imho is a must when working with panasonics is ControlCal. Lets you control the display from your laptop and save the settings files as well as load others settings files. Ex. I can give you my controlcal xml file and you can load it up and send it to your display in a mater of seconds.
Also its great for copying settings to other inputs as well.
LivingRoom: XBR-65X900B / Oppo BDP103D / Yamaha RX-A2040 / REL T7 / HDP2500 / Def Tech Mythos Ones x 4, Eight, 2x Gem XL / PS4 / Xbox One / Wii U
Bedroom: 65ZT60 / Oppo BDP93 / Apple TV / PS3
Office: KRP-500M / Xbox 360