Technology change has created an inflection point for geodata. Mobile devices, social media, retail transactions, and more generate a tremendous amount of data. The volume, variety, and velocity of data is ever increasing. What do we do about it?
LocationTech (https://locationtech.org) is a working group inside of Eclipse Foundation that many open source projects dealing with geospatial data call home.
The projects serve a wide variety of purposes, from a C/C++ library for doing spatial indexing, to a framework for rendering 3D maps on mobile devices,
but they all have a common theme: dealing with location. If you need to handle data that you can put on a map, then LocationTech would be a good place to look for open source solutions.