I'm going to be updating this post every month in 2019 with my favorite open-source projects. If you have one to recommend send it to email@example.com .
Ghost - Open Source CMS
Not even a week into the new year and I was already hooked by what Ghost was offering. After re-building my personal site twice in 2018 I finally caved and looked for a CMS to handle my back-end and Ghost was exactly what I was looking for. It only took a couple of days to get a decent understanding of HandlebarsJS which is the templating language they use after which I easily built out the website you're reading this on!