Cloud Custodian

OpenCost

opencost/opencost

Rising

CNCF open-source engine and spec for real-time Kubernetes and cloud cost allocation.

Kubecost

kubecost.com

Kubernetes cost monitoring and optimization built on OpenCost; owned by IBM since 2024.

Infracost

infracost/infracost

Shows cloud cost estimates for Terraform and OpenTofu changes directly in pull requests.

Vantage

vantage.sh

Multi-cloud cost visibility covering AWS, Azure, GCP, Kubernetes, Datadog and other SaaS spend.

CAST AI

cast.ai

Rising

Automated Kubernetes cost optimization: rightsizing, bin-packing autoscaling and spot-instance management.

KRR

robusta-dev/krr

Robusta's CLI that recommends Kubernetes CPU and memory requests and limits from Prometheus history.