Open Source

There are tools and then there are tools. Resource that are free for all (for now). The mind boggles. Some cases in point:

The Wikimedia movement - just a few of:

• Wikipedia
• Wikimedia
• WikiSource
• Wikidata

The Public Domain Review

• Also brings us: The Public Domain Image Archive

The Warburg Institue

• As they say "The Warburg Institute is dedicated to the study of global cultural history and the role of images in society. It examines the movement of culture across barriers - of time, space and discipline - to inspire, inform and connect."