Google Cloud Firestore

Python Firestore Asyncio
Firestore Python With Multiprocessing [Solution]
Firestore Python Multiprocessing Get Realtime Update (on_snapshot) [Problem]

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Firestore Python API: Quickstart Reference Guide
Firestore Subcollections
Firestore Partial Update

Support Field, List, Map, Nested Field, Delete

Firestore DocumentReference Get Local First (fall back to Server if cache doesn't exist) - Kotlin

How to maintain freshness of local cache (latest data)

Setup/Access Firestore on Cloud Functions (Python)
Android Firestore RecyclerView With FirestoreUI FirestoreRecyclerAdapter (Kotlin)
Firestore Custom Objects: Tips to handle Data Type Change