Google Earth is accessible via the default Google Cardboard app, which also includes a number of other demos. It's one of the most exciting showcase of the possibilities of VR: Sure, the textures are low-res, and the 3D models of cities it generates (while cool) are somewhat blocky.
But it lets you fly anywhere in the world in VR 3D, using only your smartphone and a bit of cardboard. And that is absolutely wild.
Another Google app not originally designed for Cardboard, Google Street View is exciting for much the same reason Google Earth is. At a stroke, Google has transformed its entire catalogue of the world's cities, previously a neat feature primarily used for navigating, into an interactive, explorable, virtual reality playground.
Ever wanted to visit the Eiffel Tower? Now you can. Wanna stroll down Fifth Avenue gazing up at the Empire State Building? Not a problem. How about just exploring the beautiful Norwegian coastline because you can? The world is your oyster.
Just load your desired destination in the app, and hit the Cardboard icon in the corner.
Vrse offers you the very best in virtual reality videos and content. It curates and showcases VR material from a variety of different sources, including music videos, short films, and The New York Times' pioneering virtual reality news reports.
Roller coaster apps are one of the best ways to get used to Cardboard — and show off its potential to others. The unimaginatively named "VR Roller Coaster attraction" takes the user through an interesting jungle setting, while not being so energetic it becomes nauseating — like some in the Googe Play Store.
It has one downside, however; while it is free to download, you can only use it a set number of times before it tries to make you pay.
Seene is a photo-sharing social network with a twist: Users' images are three-dimensional. Launched in 2013, it pre-dates Google Cardboard, and doesn't require it to run. But if you have the headset, it offers you a whole new way to experience photos on the platform. It's also totally free.
If you're after a slightly more involved roller coaster sim, check out Crazy Swing VR. It puts the user in on a fairground ride in the middle of a city (in space, because why not) — and produces the most convincing sensations of depth and motion than any Cardboard apps I've tried to date.
It's made by the same people as VR Roller Coaster attraction, and like it — annoyingly — you can only use it a certain number of times for free before it asks you to pay.
Some of the best Cardboard apps are the ones that don't try to do too much. Sure, in years to come, VR will achieve insane, photo-realistic worlds — but for now, it is just a smartphone, two lenses and some cardboard.
Lamper VR offers a taste of gaming on Cardboard without being confusing. The player controls a bee and flies them down a series of tunnels, collecting tokens and avoiding obstacles. It's simple, but has its charm.
It may just be a glorified trailer for a movie, but Insidious VR is well-reviewed, and stands as a showcase for the kind of content that virtual reality can excel at. It places the user in a house beset by supernatural activities.
One of the key draws of virtual reality is being able to explore other worlds, and Titans of Space does just that. It lets you travel around our Solar System, providing facts and details about the planets and celestial objects you encounter.
This standalone VR experience places recites war poet Siegfried Sassoon's "The Kiss" to you in a stylised landscape. It makes for a nice change of pace from the dozens of identikit roller-coaster apps available for Cardboard.
There's no real point to Lanterns, but that doesn't detract from it. You just stand by a lake and a bridge, and take in the ambience. You can change the time of day, as well as the number of lanterns floating in the sky. It makes for a calmer introduction to VR than some of the other apps available.