This very website is open source as well! I'm not going to go into too much detail here in this listing, but the website source code (minus the information that populates the config file) can be found at the GitHub repository for this project. This site is a slowly ongoing project that I work on as I find new things I wish to implement or learn new things (e.g. Angular/React) that I decide to add into the site.
For now though, welcome to the site!