You might also want to check out hermit: https://cashapp.github.io/hermit/

Definitely not as many definitions as asdf, but what it does, it does well.

That homepage could use some work. I have no idea why I might choose that over asdf.

Sorry, but you misunderstand what asdf is! In Homebrew and Hermit and others, somebody needs to create a PR to add support for a new version - with asdf, it's not necessary and it's always ahead of Homebrew and other package managers, because it directly polls the releases of a project! So, you're not a the mercy of a packages repo maintainer! I've considered Hermit, but many of the tools I needed were severely outdated so I gave up on it!

Here's an example (just picked a random project) for tflint:

Hermit (v0.39.2):

  $ hermit info tflint
  Name: tflint
  Version: 0.39.2
  Description: A Pluggable Terraform Linter
  Homepage:
  State: remote
  Source: https://github.com/terraform-linters/tflint/releases/download/v0.39.2/tflint_darwin_amd64.zip
  Root: /Users/[REDACTED]/Library/Caches/hermit/pkg/tflint-0.39.2

Homebrew (v0.39.3):

  $ brew info tflint
  tflint: stable 0.39.3 (bottled), HEAD
  Linter for Terraform files
  https://github.com/terraform-linters/tflint
  /usr/local/Cellar/tflint/0.39.3 (6 files, 23.0MB) *
  Poured from bottle on 2022-08-12 at 08:54:53
  From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/tflint.rb
  License: MPL-2.0
  ==> Dependencies
  Build: go 
  ==> Options
  --HEAD
   Install HEAD version
  ==> Analytics
  install: 10,687 (30 days), 25,133 (90 days), 70,271 (365 days)
  install-on-request: 10,683 (30 days), 25,122 (90 days), 70,251 (365 days)
  build-error: 0 (30 days)

asdf (v0.39.3):

  $ asdf latest tflint
  0.39.3

For terraform and terragrunt, I have been using tfswitch and tgswitch respectively.

Also tfswitch has the ability to parse the required_version constraint in the terraform file and switch to the appropriate version based on that which I find quite handy.

I've been using it to swap between different versions of Postgres, too.