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Pantheon: A great resource of people and bibliographical data for PAO systems
When creating a Person-Action-Object (PAO) system, sometimes a major issue is having the creativity and perseverance of coming up with a strong repository of names, pictures, and other related data to use.
While doing some research today on collective learning I came across a really well-curated a
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!