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Community
We can always use help answering questions at Let’s Encrypt Community Support. See this blog post about why community support contributions are so important.
Code
We can also use help with software development. All of our code is on GitHub.
Client Software
Certbot is a Python-based utility that works alongside your webserver to automatically obtain a certificate and convert a website to HTTPS. Certbot is the client we recommend that most people start with. Many other third party client options are available.
Server-side CA Software
Boulder is the Let’s Encrypt CA implementation. It’s based on the ACME protocol, and written primarily in Go. A great place to start is with the list of ‘help wanted’ issues and the contributors guide.
letsencrypt.org
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