<https://open-innovation-projects.org/projects/5-open-source-projects-to-collaborate-on-and-boost-your-programming-skills>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://open-innovation-projects.org/blog/5-open-source-projects-to-collaborate-on-and-boost-your-programming-skills>