I'm working on Somleng (https://github.com/somleng) - an Open Source alternative to Twilio, that's being used to save lives by powering the National Early Warning Systems of Cambodia and Laos.
We're also building OpenEWS (https://github.com/somleng/open-ews) which will be the world's first Open Source Early Warning System Dissemination Platform.
We're a small 2 person team trying to make a big difference.