Another one I've been partial too lately is recutils (https://www.gnu.org/software/recutils/ https://www.gnu.org/software/recutils/), it's similar to sqlite but

Another one I've been partial too lately is recutils (https://www.gnu.org/software/recutils/ https://www.gnu.org/software/recutils/), it's similar to sqlite but has the benefits of being minimalist and plain text. Generally I prefer actual code based configuration though, there's only a small subset of people than can read and edit these config formats but would be unable to configure something like DWM through real code (https://git.suckless.org/dwm/file/config.def.h.html https://git.suckless.org/dwm/file/config.def.h.html) and this approach gives far more flexibility without code bloat. Once customization through config is removed it's only machine-to-machine configuration that changes and these are easily handled by TOML, INI or even environment variables.