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Infochimps.com, is a site where you’ll find thousands of downloadable data sets and awesome APIs. They've spent the last few years aggregating this data so app developers and businesses can get easy access to hard-to-find data.
Big Data doesn’t have to be complicated. Anyone can use the data; a developer, individual, small agency or a huge enterprise, they're products help to get and manage the data, and go from raw data to visualisations.

Factual was founded in 2007 by Gil Elbaz, co-founder of Applied Semantics (which launched ASI's AdSense product). Applied Semantics was acquired by Google in 2003. Gil has had a lifelong passion for organizing and structuring information, and building smart tools which can make better sense of data. To that end, he set out to develop an open data platform and community in an effort to maximize data accuracy, transparency, and availability.

The London Datastore has been created by the Greater London Authority (GLA) as a first step towards freeing London’s data. Everyone should be able access the data that the GLA and other public sector organisations hold, and to use that data however they see fit – for free. The GLA is committed to request and cajole other public sector organisations into releasing their data too, and it’s an objective backed by Boris Johnson, Mayor of London. However Raw data needs to be presented in a meaningful way and most people don’t have the tools to do this, so 4iP have created a Developers’ Fund to encourage the masses of technical talent in London to transform rows of text and numbers into Facebook apps, websites or mobile products which people can actually find useful.

It’s open source.
Our global community is made up of thousands of people who want to help build the best open-source operating system in the world. They share their time and skills to make sure that Ubuntu keeps getting better and better. From IBM to Google, Firefox to Wikipedia – some of today's best software is based on an open-source model. Shared efforts. Shared principles. No cost.

Open source is collective power in action. The power of a worldwide community of highly skilled experts that build, share and improve the very latest software together - then make it available to everyone. the Open source name started in 1998 to remove the ambiguity in the English word 'free' and it is growing successful and recognised. Originally coined in 1998, the term open source came out of the free software movement, a collaborative force going strong since the dawn of computing in the 1950s. This early community was responsible for the development of many of the first operating systems, software and, in 1969, the Internet itself.
The open-source community is thriving and today boasts some of the best brains in the business. The aim has not changed: free systems and software should be available to everybody, wherever they are. Without open source, many of the systems and applications we take for granted simply would not exist. All the big players in computing come from, or owe a huge creative debt to, the open-source community, and continue to rely on its talent and expertise when developing new products.

The Open Source Initiative (OSI) is a non-profit corporation with global scope formed to educate about and advocate for the benefits of open source and to build bridges among different constituencies in the open source community. Open source is a development method for software that harnesses the power of distributed peer review and transparency of process. The promise of open source is better quality, higher reliability, more flexibility, lower cost, and an end to predatory vendor lock-in. One of our most important activities is as a standards body, maintaining the Open Source Definition for the good of the community. The Open Source Initiative Approved License trademark and program creates a nexus of trust around which developers, users, corporations and governments can organize open source cooperation.