Awesome Google Apps Scripts

TL;DR

Check out the Awesome Google Apps Script curated list on GitHub for libraries, tools, and starter templates.
Browse specialized utility repos like gsuitedevs/apps-script-samples for official examples.
Explore community hubs and boilerplate tools like clasp for local command-line development.

vandreleal/awesome-google-apps-script: A comprehensive directory showcasing open-source libraries, frameworks, desktop IDE integrations, and useful boilerplate examples.
gsuitedevs/apps-script-samples: The official repository maintained by Google, offering clean examples across various Workspace APIs including Docs, Sheets, Forms, and Gmail.
brucemcpherson/GoogleAppsScript: A large repository of advanced utility functions, API integrations, and optimization snippets from a prominent expert in the automation space.

google/clasp: The Command Line Apps Script Projects tool that lets you develop your Apps Script projects locally in VS Code, use Git version control, and deploy from your native terminal.

Totally Unscripted: A regular community show and blog covering practical automation strategies, innovative use cases, and advanced API handling.
Ben Collins’ Sheets Tips: A premier educational resource featuring specific tutorials, advanced Google Sheets formulas, and scripts for data analysis and reporting workflows.