SOPS: Secrets OPerationS is a secrets manager and editor for encrypted files of various configuration formats with support for AWS KMS, GCP KMS, Azure Key Vault, age, and PGP. It's also a CNCF sandbox project with more information available at getsops.io.
rops is an attempt at writing the SOPS in Rust, offering both a CLI and library crate. Currently supporting YAML, JSON, TOML with integrations against Age and AWS KMS.
Check out the rops book for a demo and further information on how to get started.