Diziana provides many free ready-to-use custom Zendesk® Guide Help Center Theme Templates for Zendesk Help Center. These free themes can be download from Diziana Website.
These free themes are fully functional themes with all features (as found in the premium version of the same) and can be used in any public (not fully private) help-center and by giving a clear attribution (as mentioned in licensing agreement) in all pages of the footer of help-center.
Please read Licensing terms-conditions and agreement before using Diziana Free Theme in your Zendesk® Guide Help Center Theme Templates.