Portfolio Website
This is the very site you are now using! I decided to use Gatsby.js for this project, partly because my favourite website The Coding Train website uses it, and I was impressed by how quick and responsive it is. The Coding Train is open source (GitHub) and I have made contributions its code base.
Using Gatsby and GraphQL I was able to make page generation automatic for projects. The page showing all projects with specific tags, eg CSS3 is also generated programatically. I used Contenful to manage the content of the website to gain experience of using headless CMS and because Contenful is well integrated with Gatsby.js.