Ubisoft Connect is not available for Mac but there are some alternatives that runs on macOS with similar functionality. The best Mac alternative is Steam, which is free. If that doesn't suit you, our users have ranked more than 10 alternatives to Ubisoft Connect and ten of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Ubisoft Connect are itch.io (Free, Open Source), Twitch (Freemium), Epic Games Store (Free) and Origin (Free).
itch.io gives you the ability to design a page where people can download games you have uploaded. You can optionally put a minimum price on your game (which can be 0), giving people the opportunity to pay you what they think you deserve. All files and images are hosted on itch.
The Epic Games store is now open, featuring games from other developers. Epic's goal is to bring you great games, and to give game developers a better deal: they receive 88% of the money you spend, versus only 70% elsewhere.
Formerly known as Curse, Twitch App (also Twitch Desktop App) was acquired by Twitch and rebranded as the desktop and mobile app for Twitch-based messaging. It's a fast, secure and free communications app for and by gamers.
Heroic is an Open Source Game Launcher for Linux, Windows (Beta) and MacOS (Limited to Windows games using Wine/Crossover). Right now it supports launching games from the Epic Games Store using Legendary, a CLI alternative to launch epic games.