NIST - https://csrc.nist.gov/Projects/post-quantum-cryptography/post-quantum-cryptography-standardization
NSA - https://www.tomshardware.com/news/us-national-security-agency-issues-update-on-crypto-resistant-encryption
ISARA - https://www.isara.com/products/isara-radiate.html
OQS (NIST reports on this) - https://openquantumsafe.org
MSFT - https://www.microsoft.com/en-us/research/project/post-quantum-tls
Wikipedia's take - https://en.wikipedia.org/wiki/Post-quantum_cryptography
EDIT: It should be noted that OpenSSL 1.x will be completely deprecated Sep 11, 2023.