AWS
Free for 12 months
Credit Card Required
https://aws.amazon.com/free

Azure
Free for 12 months with $200 for 1 month
Credit Card Required
https://azure.microsoft.com/free/

Azure for Students
Free while you're a student with $100.
Free for Students Only
https://azure.microsoft.com/free/students/

GCP
Free for 3 months with $300 + one Always-Free e2-micro
Credit Card or Paypal Required
https://cloud.google.com/free

Alibaba Cloud
Free for 12 months
Credit Card or PayTM Required
https://alibabacloud.com/free

IBM
Free for one month each server
Upgrade with Credit Card Required
https://cloud.ibm.com/catalog/services/hyper-protect-virtual-server

Oracle Cloud
Always Free
Credit Card or Paypal Required
https://oracle.com/cloud/free/

Vultr
Free for 2 months with $50
Credit Card, Paypal or Alipay Required
https://vultr.com/promo/try50/

**DigitalOcean **
Free for 2 months with $100
Credit Card or Paypal Required
https://digitalocean.com/

DigitalOcean for Students
Free for 12 months with $100
Credit Card or Paypal Required, Free for Students Only
https://digitalocean.com/github-students/

Linode
Free for 2 months with $100
Credit Card Required
https://linode.com/lp/free-credit/

Atlantic.net
Free for 12 months
Credit Card Required
https://cloud.atlantic.net/index.php?page=signup