Secure, close to full-node client for power users with a GUI (no Webapps etc.)

Does something like Bitcoin Core or Electrum exist for Ethereum?

I am looking for a client that’s as close as possible to a full node (but does not need to store the whole TB blockchain), has a GUI, is very secure, exists for Windows/Linux and supports some airgapped setup.

Geth and openethereum seem to fit the Bill but they are CLI only.

Everything that runs in a Webbrowser is suspect to me (incl metamask).

Which clients (NOT ledger or other hardware wallets) do “power users” use ?

Is there a GUI for geth/openethereum?