This is neat. I’ve only heard about ESTK [0] and sysmoEUICC by sysmocom [1].
ESTK supports a couple neat features, like cloud provisioning of profiles [2] (which makes it possible to add eSIM profiles on iPhone, too, not just Android).
[0]: https://estk.me/
[1]: https://shop.sysmocom.de/sysmoEUICC1-eUICC-for-consumer-eSIM...
[2]: https://docs.estk.me/manual/download/cloud-enhance/index.htm...
Note cloud provisioning does require an active data esim profile on the card already
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