- https://opensource.com/article/16/12/why-red-hat-takes-upstream-first-approach
- https://en.wikipedia.org/wiki/Upstream_(software_development)
- https://www.redhat.com/en/blog/upstream-first-turning-openstack-nfv-platform
- https://wikisuite.org/Source-Code
- https://wikisuite.org/Component-criteria#Open_development_model
- Continuous upstream