WordPress (2003)
Jekyll (2008)
Hexo (2012)
Hexo was originally created and maintained by Tommy Chen in 2012. Since then, it has helped thousands of people to build their dream website/blog.
Hugo (2013)
GitBook (2014)
Gatsby (2015)
Next.js (2016)
Nuxt.js (2016)
VuePress (2018)
Docusaurus (2017)
References
What is a Static Site Generator? And 3 ways to find the best one
The top 10 SSGs of 2018, according to StaticGen and GitHub