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Tiny AES library: https://github.com/kokke/tiny-AES-c
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Tiny ECC: https://github.com/ShubhamAnnigeri/tinyECC-ArduinoIDE
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https://ascon.iaik.tugraz.at/ This got standardized as the leightweight cryptographic standard.
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ASCON as well as several others are implemented for embedded here: https://github.com/rweather/arduinolibs
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.