There has been a recent update in Google Now that is focused in adding and integrating more apps into Google Now, to show up important information through Now Cards. Before the update only some apps, mainly Google-owned apps had the ability to show Now Cards at will but now the scenario has been changed which integrates more than 40 Apps in the app making it more useful and user-friendly for the user.
This is the official Google Blog Post that recognises and sheds some light on this update :-
Starting today, the Google app on Android can help you keep up with all the good stuff in 40 different apps at a glance—it’ll bring you Now cards to help you out with your day-to-day life, giving you information that’s helpful to you, right when you need it.In the morning, catch up on news of the day with cards from The Guardian. On your commute, Pandora can give you recommendations for music to play, based on what you like, or you can be reminded to complete your daily French lesson on Duolingo. During your downtime, you can take care of the groceries, with a card from Instacart reminding you to stock up on the things you often order. If you’re planning a trip and looked up places to stay on your Airbnb app but couldn’t make up your mind, you’ll see Now cards from Airbnb for the location and dates you’ve researched. And when you land at an airport, you’ll see a card to order a Lyft.
This is the link to the official blogpost, accompanying this here is the link that shows you a thumbnail list of the apps that were integrated.
Source: Google