This dApp allows you to store your ETH in a smart contract. With the benefit that a guardian can move your funds for you if you lose your keys!

This is semi-trustless, as even if you select a malicious guardian. He has to wait for a grace period (30 days) before he can move the funds. You can see the guardian request on the blockchain and get your funds back if this happens.

The Ethereum address that you select as a guardian can be an address on a cold wallet you own, a software wallet you own, an address that a friend or family member controls, or even an institution that exists to provide this service for you.