I can confirm that bring-your-own certificates, ACME, and mTLS are all included in the OSS version. For enterprise users, Traefik Hub also provides seamless integration with HashiCorp Vault.
Regarding the cache middleware: like many of our more advanced middlewares, you have two options. You can use a community-maintained plugin (such as Souin), or your organization can purchase an enterprise license to access TraefikLabs' officially maintained built-in middleware as part of Traefik Hub API Gateway or Traefik Hub API Management.