Always Free

Azure

https://azure.microsoft.com/en-us/free/free-account-faq/

Free 2 million characters included for Translator Text API
Free 5 GB per month analysis plus 31-day retention period with Log Analytics    
Azure Maps S0 account tiers offer 250,000 monthly map tile loads and 25,000 monthly service calls

10 web, mobile, or API apps with Azure App Service with 1 GB storage
1 million requests and 400,000 GBs of resource consumption with Azure Functions
100,000 operations for event publishing and delivery with Event Grid
Free Azure Container service to cluster virtual machines
50,000 stored objects with Azure Active Directory with single sign-on (SSO) for 10 apps per user
50,000 active users per month (MAU) with Azure Active Directory B2C
Free Azure Service Fabric to build microservice apps

Unlimited nodes (server or PaaS instance) with Application Insights and 1 GB of telemetry data included per month
Unlimited use of Azure DevTest Labs

Machine Learning with 100 modules and 1 hour per experiment with 10 GB included storage

Free policy assessment and recommendations with Azure Security Center
Unlimited recommendations and best practices with Azure Advisor

Azure IoT Central includes up to 5 devices with 50,000 monthly messages per device
Free Azure IoT Hub edition includes 8,000 messages per day with 0.5 KB message meter size
Free namespace and 1 million push notifications with Azure Notification Hubs

5 free low frequency activities with Azure Data Factory
50 MB storage for 10,000 hosted documents with Azure Cognitive Search including 3 indexes per service

Unlimited Azure Batch usage for job scheduling and cluster management
First 5 users free with Azure DevOps
Free 500 minutes of job run time with Azure Automation
Unlimited users and 5,000 catalog objects with Azure Data Catalog
30,000 transactions per month processing at 20 transactions per minute with Face API

Free public load-balanced IP with Azure Load Balancer
5 GB of bandwidth for outbound data transfer with free unlimited inbound transfer
50 virtual networks free with Azure Virtual Network
Unlimited inbound Inter-VNet data transfer

AWS

https://aws.amazon.com/free

Lambda: 1M free requests per month
Amazon DynamoDB 25 GB of storage

GCP

https://cloud.google.com/free/docs/free-cloud-features#free-tier

GAE
    28 hours per day of "F" instances
    9 hours per day of "B" instances
    1 GB of egress per day
GCE
    1 non-preemptible e2-micro: Oregon: us-west1 / Iowa: us-central1 / South Carolina: us-east1
    30 GB-months standard persistent disk | 1 GB network egress except CN/AU
GCS: 5 GB + 1 GB network egress*
Firestore DB: 1 GB storage

Oracle

https://docs.oracle.com/en-us/iaas/Content/FreeTier/freetier_topic-Always_Free_Resources.htm

2 AMD based Compute VMs Standard.E2.1.Micro with 1/8 OCPU** and 1 GB memory each, in one availability domain | 1 OCPU  = 2 x86 vCPU or 1 ARM vCPU
Arm-based Ampere A1 cores and 24 GB of memory usable as 1 VM or up to 4 Standard.A1.Flex VMs with 3,000 OCPU hours and 18,000 GB hours per month
2 Block Volumes Storage, 200 GB total
10 GB Object Storage – Standard
10 GB Object Storage – Infrequent Access
10 GB Archive Storage
Resource Manager: managed Terraform
5 OCI Bastions

Free CI/CD

Github

https://github.com/pricing

https://docs.github.com/en/actions/learn-github-actions/usage-limits-billing-and-administration

https://docs.github.com/en/actions/learn-github-actions/understanding-github-actions#runners

https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners

Jetbrains

2,000 Computation Credits per month : https://www.jetbrains.com/space/buy/?billing=yearly#cloud
1 CC/m = 2 vCPU + 7800MB memory : https://www.jetbrains.com/help/space/billing-and-limits.html

Compare

Instance

GCP: 20% vCPU + 0.60GB, Free - $4.09
Azure: 1vCPU + 0.5 GiB, $1.45/m(West US 2, 3-year) Amazon: 5% vCPU + 0.5GB, 3 Year Reserved Instance $69

Traffic

Amazon: 1GB to 10 TB / month $0.090 per GB, Singapore to China $0.120 per GB
Google: $0.12 - $0.23 / GB, Singapore to China $0.23
Microsoft: 5 GB - 10 TB 2 /Month $0.087 - $0.181 per GB, Japan to China $0.138 per GB

Price

AWS

https://aws.amazon.com/ec2/pricing/
https://aws.amazon.com/ec2/pricing/reserved-instances/pricing/ https://aws.amazon.com/blogs/aws/ec2-update-t2-nano-instances-now-available/
Traffic: https://aws.amazon.com/ec2/pricing/on-demand/ https://calculator.s3.amazonaws.com/index.html

Azure

https://azure.microsoft.com/en-us/support/plans/
https://docs.microsoft.com/en-us/azure/cost-management-billing/costs/cost-analysis-common-uses#view-cost-breakdown-by-azure-resource

https://azure.microsoft.com/en-us/pricing/calculator/
https://azure.microsoft.com/en-us/pricing/details/app-service/
https://azure.microsoft.com/en-us/pricing/details/bandwidth/

5 GB - 10 TB /Month: $0.12 per GB

https://azure.microsoft.com/en-us/pricing/details/ip-addresses/

BASIC (CLASSIC) + Dynamic IP address + First Cloud Service VIP = free

GCP

https://cloud.google.com/pricing/
https://cloud.google.com/compute/pricing
https://cloud.google.com/storage/pricing

IBM

https://www.ibm.com/cloud/pricing https://ace-docs-production-black.cdn.au-syd.s-bluemix.net/docs/pricing/

China

https://www.aliyun.com/price/product?#/ecs/detail (Compute)
https://help.aliyun.com/document_detail/25382.html (HDD)

https://www.qcloud.com/document/product/213/2179

https://www.qingcloud.com/pricing/plan

https://www.sinacloud.com/index/price.html

https://www.daocloud.io/pricing/public.html

VPS

https://www.vultr.com/pricing/
https://www.linode.com/pricing
https://www.digitalocean.com/pricing/

Limited Free

AWS

https://aws.amazon.com/free/

Azure

$200: https://azure.microsoft.com/en-us/offers/ms-azr-0044p/

https://azure.microsoft.com/en-us/free/

15 GB outbound

https://tryappservice.azure.com

IBM

https://www.ibm.com/cloud/pricing

VPS

DigitalOcean $20: https://cloud.docker.com

CDN

China

JD 动态加速 赠送流量：https://docs.jdcloud.com/cn/cdn/billing-overview
qn 10G/m/http：https://www.qiniu.com/prices/qcdn
tx 新户100G/6m： https://buy.cloud.tencent.com/price/cdn/overview
ali：https://www.aliyun.com/price/detail/cdn
hw： https://www.huaweicloud.com/pricing.html#/cdn

dcloud free: https://uniapp.dcloud.net.cn/uniCloud/price.html#%E5%85%8D%E8%B4%B9%E9%A2%9D%E5%BA%A6

云函数： 资源使用量：1000GBs/月 调用次数：1.5万次 出网流量：1GB 云数据库： 集合数量 100 / 索引数量 400 容量：2GB 读操作数：0.05万次/天 写操作数：0.03万次/天 云存储： 容量：5GB 下载操作次数：0.2万次 上传操作次数：0.1万次 CDN流量：1GB 静态网站托管： 容量：5GB CDN流量：1GB