These are sites I've personally used and found being competitive, user friendly and having a reasonable user license.
Docker - https://www.docker.com/
Kubernetes - https://kubernetes.io/
k3s: minimalistic kubernetes - https://k3s.io/
k3d: k3s in Docker - https://github.com/rancher/k3d
k0s - https://k0sproject.io/
Terraform - https://www.terraform.io/
Ansible - https://www.ansible.com/
Helm - https://helm.sh/
Parsec - https://parsecgaming.com/
Shadow - https://shadow.tech/shadowpc
Geforce Now - https://www.nvidia.com/en-us/geforce-now/
Google Stadia - https://stadia.google.com/ (shutting down)
BitWarden - https://bitwarden.com/
KeyBase - https://keybase.io/
Signal - https://signal.org/
Twingate - https://www.twingate.com/
Pexels - https://www.pexels.com/
Unsplash - https://unsplash.com/
Free image search - https://www.everypixel.com/free