That site is created by the maintainers of D2[1], so it might be biased, but I still think D2 has the friendliest syntax of the bunch, including nomnoml. [1]:

That site is created by the maintainers of D2[1], so it might be biased, but I still think D2 has the friendliest syntax of the bunch, including nomnoml. [1]: https://d2lang.com/ https://d2lang.com/