Research Official Open Source Software Merchandise Stores

[yaph]

Search for official open source software merchandise stores, that meet one of the following criteria:

• The store is hosted on the project's website, valid examples would be store.project.org or project.org/store.
• The store is linked from the project's website, which includes stores on platforms like Redbubble or Teespring.

For valid stores create one pull request per store adding the link with a description in the Open Source Software section. Please follow the contribution guidelines.