Google Cloud ($300) (90 days)
https://cloud.google.com/gcp
DigitalOcean ($200) (60 days)
https://try.digitalocean.com/cloud/
Microsoft Azure ($200) (30 days)
https://azure.microsoft.com/en-us/free/search/
Oracle ($300) (30 days)
https://www.oracle.com/cloud/free/
Vultr ($250) (30 days)
https://www.vultr.com/promo/try250
Linode ($100) (60 days)
https://www.linode.com/lp/free-credit-100-5000