There are 2 repositories under sitecore9 topic.
Umbrella for Sitecore JSS is a utility that synchronizes items from your Sitecore JSS to your local JSS development environment
This repository contains Powershell scripts that will help you install Sitecore 9.x
A simple starter kit, that's designed to be a basic developer accelerator for working with Sitecore. The issue with other helix starter kits, is that they add additional features you might not need, especially if you are not building out a full blown website.
Adds a data section under the Quick Info section in Content Editor which shows the published URL of your item.
Sitecore module for creating chatbots through CMS
WebForms sublayouts in MVC renderings for Sitecore 9.x
Provides 3 gutters for Data Exchange Framework for Sitecore
Sitecore Content Tagging with Cortex and Custom Tags Structure
Module allowing to insert custom javascript to Sitecore Forms submit
Algolia Search connector for Sitecore Commerce
Common extensions to Sitecore contentSearch. Hereunder PopulateSolrSchema pipeline processors to ensure that all installed languages in Sitecore are added to the solr managed schema.
Sitecore Platform Essentials for Developer eLearning Student Lab Guide
Email Validation Rule For Sitecore Marketing Automation
Update Contact action for Sitecore 9 Forms