I am enthusiastic how I can create extension same as GIS.XL for LibreOffice instead of Microsoft Excel!?
I am going to know where should I start?
http://www.gisxl.com/Features
The GIS.XL add-in provides features and functions for work with spatial data directly inside the Excel environment. Add-in includes a standard interface, familiar from other GIS programs - Map and Legend. Combine Excel (tabular data) and spatial (map) data in layers.