What's the newest tool you've added to your sales stack, and how's it working out for you?

I recently started using DealLab. It helps me communicate with our prospects and clients effectively by centralizing all communications and sales collaterals. BTW, I hunted them on PH today: https://www.producthunt.com/posts/deallab-2 What's the newest tool you've added to your sales stack, and how's it working out for you? Feel free to drop the name, share your thoughts, or discuss any unique features that caught your eye. Let's discover new tools to add to our sales stacks!