This collection presents the key sites that provide data, whether through curated collections, offering access under the Open Data movement or through Software/Data-as-a-Service platforms. Please note, I may not have personally used all the services, sites or tools presented but have seen sufficient evidence of their value from other sources. Also, to avoid re-inventing the wheel, descriptive text may have been reproduced from the native websites for many resources.
You will see there is clearly a certain bias towards US and UK based sites and services. This is simply because they are the most visible, most talked about, most shared and/or useful resources on my radar. I will keep updating this site to include as many other finds and suggestions as possible, extending (ideally) around the world.