Google Cloud

App Engine - 28 frontend instance hours per day, nine backend instance hours per day
Cloud Firestore - 1GB storage, 50,000 reads, 20,000 writes, 20,000 deletes per day
Compute Engine - 1 non-preemptible e2-micro, 30GB HDD, 5GB snapshot storage (restricted to certain regions), 1 GB network egress from North America to all region destinations (excluding China and Australia) per month
Cloud Storage - 5GB, 1GB network egress
Cloud Shell - Web-based Linux shell/primary IDE with 5GB of persistent storage. 60 hours limit per week
Cloud Pub/Sub - 10GB of messages per month
Cloud Functions - 2 million invocations per month (includes both background and HTTP invocations)
Cloud Run - 2 million requests per month, 360,000 GB-seconds memory, 180,000 vCPU-seconds of compute time, 1 GB network egress from North America per month
Google Kubernetes Engine - No cluster management fee for one zonal cluster. Each user node is charged at standard Compute Engine pricing
BigQuery - 1 TB of querying per month, 10 GB of storage each month
Cloud Build - 120 build-minutes per day
Cloud Source Repositories - Up to 5 Users, 50 GB Storage, 50 GB Egress
Google Colab - Free Jupyter Notebooks development environment.
Full, detailed list - https://cloud.google.com/free

Introduction