Ultradox is hands down one of the coolest apps available on the G Suite Marketplace. The amount of flexibility it offers, especially if you have a little bit of technical experience is amazing!
The first time I discovered this app, I spent like 5 hours playing around with different techniques, methods and strategies to achieve certain business objectives.
Additionally, it acts as an awesome bundle pack across all your G-suite tools (Docs, Sheets etc) which allows you to do stuff like design a responsive email template in Google Docs, get it converted into HTML. Read contact details from Google Sheets and, send using Gmail or a third party API.
I'd like to be clear, I'm not just writing this to score myself brownie points or some kind of license upgrade. I am genuinely impressed with the way this app was built, and the possibilities it offers for SMEs. (Not to mention a cost saving of not requiring a bunch of third party apps or Chrome plugins - as this can be a replacement).
Keep up the good work guys!