The Python script in this directory, by mbarkhau allows you to write out a basic ErgoDox EZ keymap using Markdown notation, and then transpile it to C, which you can then compile. It's experimental, but if you're not comfortable using C, it's a nice option.
This Python 3 script, by Tsan-Kuang Lee takes the keymap.c downloaded from ErgoDox EZ Configurator and beautifies it for easier customization, allowing one to quickly draft a layout to build upon.
See README.md for this utility for more details.