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rathole
A lightweight and high-performance reverse proxy for NAT traversal, written in Rust. An alternative to frp and ngrok.
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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.
Rathole is also a simple lightweight solution if you're open to alternatives to haproxy.
Here is something on GitHub that roughly follows this paradigm, and was made to use SES as the "email server".
I've also made my own version (that really was intended for my own use) of the above product, found here. I won't lie, I haven't touched in the years since I made it, but it still works to this day (and I still use it now).
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.