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There are multiple solution do it, using rest api, csom, server side code by including Microsoft.sharepoint dll but all will work only, if the user is authenticated or pass the network credentials or User should be in the network/domain itself. Is it possible to retrieve values from different sharepoint onpermises site [without passing the credentials] and show it in a singe ASP.net web application [may be internet application] ?
Please suggest if any workaround is present ?
I don't think that's possible, You're requesting to break SharePoint security,
I would recommend to use impersonation and connect using a service account.
every single application or service that connects to SharePoint requires at least a service account.
