You can have some public pages using LLNG framework. To enable this:

• Add "customPlugins = ::Plugins::PublicPages" in your "lemonldap-ng.ini" file to enable this plugin;
• Create a "public" subdir in your template directory;
• Create your .tpl files inside;
• To access them, use "http://auth.your.domain/public/name" where "name" is the template name (without .tpl).