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FIDO2 USBtoken optimized for security, extensibility, and style
Nitrokey FIDO2 is an open source security key that supports FIDO2 and U2F standards for strong two-factor authentication and password-less login. It protects you against phishing and other online attacks. It's based on Solokey. This repository contains the firmware, including implementations of FIDO2 and U2F (CTAP2 and CTAP) over USB and NFC. The main implementation is for STM32L432, but it is easily portable. For development no hardware is needed, it also runs as a standalone application...
AVR based smartcard/token with ECC and RSA cryptography
...Compatible with MyEID card from Aventra. Supported in windows and linux by opensc package. Allow about 64KiB space for keys/certificates. PKCS#15 structure supported. USBtoken with CCID interface based on xmega128a4u with same features as card. High speed AVR multiple precision arithmetic: squaring, multiplication, exponentiation.