Alternatives · IaC
Pulumi alternatives (2026)
Pulumi: IaC for developers who want real programming languages.
Its Catch: Smaller ecosystem than Terraform.
Below: 3 free or free-tier tools from the same category (iaC tools), free and open source first, then the closest match by shared tags. Each keeps its own Catch.
Free / OSS · OSS/MIT · 26.4k GitHub stars
VerdictMIT IaC for AWS. Live dev is the feature; the bill is still Amazon.
CatchAWS-shaped. Other clouds are not the happy path. You still pay AWS. The Ion/v3 cut left a trail of outdated v2 tutorials — read current sst.dev docs.
Free / OSS · MPL-2.0 · 30.6k GitHub stars
VerdictMPL-2.0 Terraform-compatible IaC. The OSS license answer to BSL.
CatchVs Terraform/Pulumi: license-first fork of Terraform 1.5-era lineage — not Pulumi programming-language IaC. Not HashiCorp Cloud/Enterprise features. Provider edge cases exist; verify before big migrations.
Free / OSS · Source-available (BUSL-1.1) · 50k GitHub stars
VerdictThe default IaC tool; fine to self-host, and OpenTofu is there if you need open source.
CatchTerraform is under BUSL-1.1 (Business Source License): free to use and self-host, including in production, but you can't offer it as a competing paid hosted or embedded service. Each version becomes MPL-2.0 four years after release. OpenTofu is the MPL-2.0 fork. GitHub shows the license as NOASSERTION because BUSL is not an OSI license; the LICENSE file is the one to read.
FAQ
- What are the best free alternatives to Pulumi?
- SST, OpenTofu, Terraform. All are reviewed on Stack Gems in the same category (iaC tools); 3 free or open source.
- What is the catch with Pulumi?
- Smaller ecosystem than Terraform.
- Is there an open-source alternative to Pulumi?
- Yes: SST (OSS/MIT), OpenTofu (MPL-2.0), Terraform (Source-available (BUSL-1.1)).