Isotammi collection of expert addons (wiki)
Isotammi Expert addons (5.2)
https://raw.githubusercontent.com/Taapeli/isotammi-addons/master/addons/gramps52
Isotammi Expert addons (6.0)
https://raw.githubusercontent.com/Taapeli/isotammi-addons/master/addons/gramps60
For 5.1 and 5.0, use the Third party addons management in the General tab of Preferences
https://raw.githubusercontent.com/Taapeli/isotammi-addons/master/addons/gramps