FinOps Resource Directory
The best open-source tools for cloud cost visibility, optimization, and governance. Curated by engineers — no vendor sponsorships, no paywalls.
Cost Visibility
See where your cloud spend actually goes — by team, service, or resource.
Infracost
⭐ 10.5k GitHub starsCloud cost estimates for Terraform in pull requests. See cost impact before you ship infrastructure changes.
OpenCost
⭐ 5.2k GitHub starsKubernetes-native cost monitoring by CNCF. Real-time cost allocation for workloads, namespaces, and labels.
Komiser
⭐ 3.8k GitHub starsCloud-agnostic cost dashboard. Inventory and cost analysis across AWS, Azure, GCP, OCI, and more.
Cloud Custodian
⭐ 5.6k GitHub starsRules engine for cloud resource management. Find orphaned resources, enforce tagging policies, and auto-remediate.
Optimization
Right-size, schedule, and eliminate waste automatically.
Kubecost
⭐ 2.1k GitHub starsKubernetes cost allocation with rightsizing recommendations. Identify overprovisioned pods and namespaces.
aws-nuke
⭐ 5.8k GitHub starsRemove all AWS resources from an account. Essential for cleaning up dev/test environments before they bleed cost.
ec2instances.info
⭐ 3.9k GitHub starsInteractive EC2 instance type comparison. Filter by vCPU, RAM, network, and price. Indispensable for rightsizing.
Spot Ocean (Ocean Controller)
⭐ 98 GitHub starsIntelligent Spot Instance management for Kubernetes. Automatically replaces on-demand with spot nodes, handles interruptions.
Governance
Enforce policies, tag everything, and prevent cost surprises before they happen.
Steampipe
⭐ 7.1k GitHub starsSQL queries across AWS, Azure, GCP, and 140+ providers. Query your entire cloud estate with familiar SQL.
Terracost
⭐ 840 GitHub starsTerraform cost estimation library. Embed cost awareness directly into your IaC pipelines and automation.
Goldilocks
⭐ 4.5k GitHub starsKubernetes resource request/limit recommendations using Vertical Pod Autoscaler. Stop guessing at container sizes.
Kube-Green
⭐ 1.2k GitHub starsAutomatically suspend Kubernetes workloads when not in use. Perfect for dev/staging clusters that don't need to run overnight.
Our Calculators
Interactive cost calculators built by Cost Nimbus — free, no account required.
NAT Gateway Calculator
Calculate exact savings from replacing AWS NAT Gateway with VPC endpoints. See the 91% savings scenario with your actual numbers.
Storage Cost Calculator
S3 vs Cloudflare R2 vs Backblaze B2 — compare real monthly costs for your storage workload including egress.
SIEM TCO Calculator
True cost comparison: Splunk vs Sentinel vs Elastic vs Wazuh. Includes license + compute + storage + engineering time.
More Resources
Official tools and community platforms
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