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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
If you don't want to be tied to the Amazon ecosystem, which is something you've indicated in other comment threads, the most common choices with a Kobo or Pocketbook. Alternatively, a Tolino if you're from Europe. All three read basically any format except Amazon ones by default, but if you have any Amazon file formats, you can convert to epub using Calibre [ https://calibre-ebook.com/ ] and is a relatively straightforward process.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.