If you are using Rust for web or considering doing so, you might be excited to hear that rustls merged a PR to make ring an optional dependency. Soon(-ish) you will be able to choose which cryptography backend to use with rustls, including one written fully in Rust. That would help with making your projects easier to build.
Big thank you to rustls team, including Joe Birr-Pixton, @djc, and @cpu!
https://github.com/rustls/rustls/pull/1405