Habbo (Free + IAP)
Virtual world Habbo has launched an official Android app, giving people full access to its pixel world from their devices. Aimed at teenagers, the app enables them to chat, create rooms and decorate their avatars.

Riff (Free)
The riff is the latest experimental app from Facebook, promising the ability to “make videos with friends.” How? By filming a clip, then sharing it for friends to add their footage, then their friends, and so on. It’s fun, but will anyone still be using it in a couple of months?

Office Lens Preview (Free)
This from Microsoft is an official beta for its new workplace app: to get access; you have to sign up for its Google+ page to become a “tester.” It’s worth a look: the app lets you snap documents and whiteboards, cleans up the image and turns it into a Word, PowerPoint or PDF file.

Spell With Pip (£2.49)

Oxford University Press is the company behind this educational children’s app, which teaches children spelling skills using a colorful mini-game with a parrot flying around the screen catching letters.

File Transfer by Infinite (Free)
A clean, simple file-sharing app here, focused on sending photos and videos to friends at their full resolution, rather than compressing them. Naturally, you’ll want to be connected to a Wi-Fi network when using it.

Materials World Magazine (Free + IAP)
A specific niche here: this is the official app for the magazine of the Institute of Materials, Minerals, and Mining. But if materials are your thing – “metals, plastics, polymers, rubber, composites, ceramics, glasses, natural materials, wood, and packaging” – then the app is a slick way to keep up to date.

Selfied for Messenger (Free)

And Selfie d gets you to take photos of yourself to match a range of moods – from “Thumbs Up” to “Sad” – and then use them in place of emoticons during your Facebook Messenger conversations.

The Guardian