Secure Networking Between Different Cloud Providers

Manager

netbird https://github.com/netbirdio/netbird
or
netmaker https://github.com/gravitl/netmaker

Trying netbird, as it has login options

Requires Identity and Access Management (IAM) solution
Open Source/Self Hosted
keycloak https://github.com/keycloak/keycloak | https://netbird.io/docs/integrations/identity-providers/self-hosted/using-netbird-with-keycloak
Cloud Hosted
Auth0 https://auth0.com/ | https://netbird.io/docs/integrations/identity-providers/self-hosted/using-netbird-with-auth0