Here is a list published by Apple of carriers providing eSIM support.
SAS Accredited Sites List
Top eSIM vendors & manufacturers in the world
G+D Mobile Security https://www.gi-de.com/en/de/mobile-security/
Gemalto (Now Owned by Thales) https://www.gemalto.com/
GSMA eSIM Pages
GSMA eSIM Whitepaper: The what and how of Remote SIM Provisioning
Sim alliance IoT/M2M Educational resources
Attacks against GSMA’s M2M Remote Provisioning
Will eSIM eradicate international roaming?
Global Platform approved eSIM Testing tools
PTCRB is a certification organization established in 1997 by leading wireless operators to define test specifications and methods to ensure device interoperability on global wireless networks.
eSIM icon Usage Guidelines