Terraform
Terraform has been the defacto standard for IaC. However, it was knocked out of its “Adopt” classification in the Tech Radar due to the commercial license change. This means that it has become too cost-prohibitive for some companies, which have invested in other solutions.
At the time of this writing OpenTofu – an open-source fork of Terraform created before the license change to maintain a free and community-driven alternative – is a compelling option. However, it will diverge eventually; making choice confounding. If you can use Terraform, do so. Otherwise, there are plenty of good alternatives.
A later announcement by IBM on the purchase of Hashicorp made the license change understandable. IBM does have a long history of supporting the open source community, but they are a commercial entity. Therefore, we remain cautious about Terraform’s future as the de facto standard.