http://keralarescue.in/ is the website for coordinating the rehabilitation of the people affected in the 2018 Kerala Floods. The GitHub link is there on the website.
Here is an opportunity for all techies out there to contribute to the development and maintenance for this website. It is going to be a good learning and social experience. Browsing the slack channel discussions itself would be a great case study of community-driven software development in the context of calamity.