OpenStreetMap

Why: 'When there is a humanitarian crisis, such as the Nepal earthquake, OpenStreetMap (OSM) volunteers from around the world rapidly digitize satellite imagery to provide maps and data to support humanitarian organizations deployed to the affected countries.'

see other info + "How To Get Involved" :http://wiki.openstreetmap.org/wiki/2015_Nepal_earthquake

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"The Internet Mapmakers Helping Nepal"

How "crisis mappers" activate after a catastrophe

http://www.theatlantic.com/technology/archive/2015/05/the-ma...

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"How hundreds of volunteer mappers are helping to keep Nepal earthquake aid from getting lost"

http://scroll.in/article/724301/how-hundreds-of-volunteer-ma...