I wanted a CLI program with a simple configuration format, so that I could integrate it with my static site generator build process and version control.
I built fontite to fulfill that need. The linked page demonstrates how you might use it to combine icons from 7 different WOFF2 and SVG sources, and only require about 4kB to serve all of them, with no JS required!
I now use this on my personal website [1] and I'm very happy with it. If you're curious, there's more information on the GitLab repo [2] and I wrote up a summary of the making process [3] as well.
I'd love to see some smaller, faster websites using this tool!
[1] https://antonok.com [2] https://gitlab.com/antonok/fontite [3] https://antonok.com/projects/fontite