PLATFORM: ANDROID

United Nations Foundation

It takes all nations and all sectors to make progress on the most important and far-reaching international challenges. We are an advocate for the UN and a platform for connecting people, ideas and resources to help the United Nations solve global problems. We build partnerships, grow constituencies, mobilize resources and advocate policy changes to support the UN’s work for individual and global progress.

Ushahidi

We are a non-profit tech company that specializes in developing free and open source software for information collection, visualization and interactive mapping. We build tools for democratizing information, increasing transparency and lowering the barriers for individuals to share their stories.

vinspired

Thinking about volunteering? From stewarding at the biggest music festivals, helping out at football clubs, or even helping to stop cyber bullying from comfort of your own home - however and whenever you want to make a difference, the vinspired app helps you give something back.

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Weather Underground

Weather Underground is committed to delivering the most reliable, accurate weather information possible. Our state-of-the-art technology monitors conditions and forecasts for locations across the world, so you'll always find the weather information that you need.

WebMD

WebMD provides valuable health information, tools for managing your health, and support to those who seek information. You can trust that our content is timely and credible. 

Wikipedia

Wikipedia is a multilingual, web-based, free-content encyclopedia project based on an openly editable model. The name "Wikipedia" is a portmanteau of the words wiki (a technology for creating collaborative websites, from the Hawaiian word wiki, meaning "quick") and encyclopedia. Wikipedia's articles provide links to guide the user to related pages with additional information.

Wunderlist

Wunderlist makes it downright simple to organize your daily life. Just create a list and start filling it with things that need to be completed. Keep track of your more important tasks with reminders and notifications. You can even create a new task for Wunderlist straight from your email inbox. Oh, and did we forget to tell you? Its free!

WWF

For 50 years, WWF has been protecting the future of nature. The world’s leading conservation organization, WWF works in 100 countries and is supported by 1.2 million members in the United States and close to 5 million globally. WWF's unique way of working combines global reach with a foundation in science, involves action at every level from local to global, and ensures the delivery of innovative solutions that meet the needs of both people and nature.

WWF USA - http://www.worldwildlife.org/home-full.html