This repository is a curated list of email newsletter tools, platforms, and resources. It is not a software application or data pipeline; it is a static reference list maintained by a community. The only code is a Python script to alphabetize the markdown lists and a GitHub Actions workflow to run it automatically on pushes to the README. The repository serves as a directory for newsletter creators to discover tools for advertisements, communities, deliverability, discoverability, inbox management, platforms, referral programs, and sponsorships. It is well-organized and actively maintained, but offers no reusable software components beyond the simple alphabetization utility.