Wdym TLS is an enterprise feature? I'm using mTLS and TLS in their OSS version. The certificates are generated via cert-manager. If you expect something like Caddy's auto-provision of certs, then (AFAIK) neither HAProxy nor NGINX have it
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.