There are 2 repositories under add-to-dialogflow topic.
Webhook Boilerplate (using Dialogflow) in Node.js
Integrating an API with Dialogflow's Fulfillment
Integrating Firebase's Firestore database with Dialogflow
Integrating Google Calendar API with Dialogflow's Fulfillment & Knowledge Connectors
Rich Responses sample (using Dialogflow) in Node.js
Parameters sample (using Dialogflow) in Node.js
Integrating Actions on Google Client Library with Dialogflow's Fulfillment Library
Sample integrating Telephony, Google Sheets, and Slot Filling with Dialogflow
Dialogflow's Importer for Alexa Skills to import a Alexa Skill to Dialogflow
Slot Filling with Dialogflow Fulfillment
Sample demonstrating how to make a Dialogflow agent compatible with 9 platforms
Integrating Dialogflow's Knowledge Connectors, Phone Gateway, and Actions on Google
This sample demonstrates how to create and update developer entities using the Dialogflow Node.js Client and the Dialogflow Fulfillment Library. It also demonstrates how to create session entities from your fulfillment code.
Sample showing how to use multiple languages and locales (e.g. English and French)
Validate Entities with Regular Expressions in Dialogflow's Fulfillment