I have never used nforwardauth, but it looks like it offers a subset of the functionality of VoidAuth. Both support proxy-auth, but VoidAuth has user management features and also supports OIDC, passkeys, etc. I think nforwardauth looks like a great project, you can always setup VoidAuth alongside and try it out!

My previous setup was with Authelia and lldap, and VoidAuth is heavily inspired by a combination of both. I think the advantages VoidAuth has are simple user management, supporting user registration/invitation, more branding customization, and a better end-user UI (imo).

There are other great selfhosted auth solutions such as Authelia and lldap, and also Authentik, Keycloak, pocket-id, and Rauthy. I would encourage anyone looking for a selfhosted auth solution to shop around!