GN&M's consists of a content API, which allows users to search the database and download content from articles in a format that is easy to integrate with other web applications, and the Data Store, a directory of statistics curated by Guardian editors.
The content API and the Data Store are available for free in return for carrying Guardian advertising.
Emily Bell, director of digital content at Guardian News & Media, said: "Openness and transparency are key strategic objectives for Guardian News & Media.
"Today's developments mark a new chapter in our history and a new foundation for the future of our journalism.
"GNM's ambition has always been to be 'of the web' and not just 'on the web' and with the launch of the Open Platform we are fulfilling this.
"As more users recognise the value of acquiring our content to enhance their own projects, GNM content will be woven into the fabric of the internet. We look forward to seeing the innovative directions users take with our content."
has already made available over 80 sets of data from child poverty in England to world carbon emissions by country. New data is added to the store each day.
Open Platform is a beta trial and the final version will incorporate feedback from partners.
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