Welcome! Cryptography I hear you say!

Well, if you are interested, along with what @liminal shared, GitCitadel does a few things now, including a library I maintain as the C reference implementation of the nip44 encryption spec. The library is called noscrypt, and it's purpose is to be a fully featured (and compliant) cryptography utility library, it focuses on correctness, stability, and performance. 

We also work on Aedile, an up-and-coming C++ sdk. 

Here is the full project list
https://wikifreedia.xyz/a/naddr1qvzqqqrcvgpzphtxf40yq9jr82xdd8cqtts5szqyx5tcndvaukhsvfmduetr85ceqydhwumn8ghj7argv4nx7un9wd6zumn0wd68yvfwvdhk6tcqpankjarrd96xzer9dskkgmmrwvlzm7aq