Germany's thriving startup scene is one of the most unique in Europe.
The capital Berlin is home to a mixture of hackers, privacy experts, scientists, and video companies that are making waves in the tech scene.
Here are some underground companies as well as more established names that are worth watching.
17. Foundd
Foundd is a site that recommends movies based on what you like, as well as what your group of friends likes. That's different to services like Netflix, which just look at your own viewing history.
The company earns money when people click through to buy movies on iTunes — so it want to make the recommendations as good as possible.
Mashable reports that Foundd raised a $350,000 (£223,000 round) of funding in 2013 from investors including JMES Investments, Lars Dittrich, and Tao Tao (a cofounder of GetYourGuide).
16. Crate
Crate offers an impressive technology that lets startups and companies easily set up distributed data centres. Why's that important? Well, startups don't want to put all their data in one place. With Crate, companies can spread their data around, and Crate handles all the hard work.
Crate raised $1.5 million (£957,000) from investors, including Sunstone And DFJ Esprit, in 2014. It also beat out other companies to wn a £30,000 prize at TechCrunch Disrupt Europe in 2014.
15. Plinga
Plinga is a Berlin-based video game developer that creates social games for a wide audience. Founded in 2009, the company has launched a series of games, including Family Barn (27 million players) and Dragons of Atlantis (13 million players).
Unlike its competitors, Plinga makes it games available to embed around the web, so they're not just playable on its own sites. That's different to how rivals like Zynga and King work.
Plinga began as a direct competitor to Zynga, featuring a game called FunCards ("Like UNO, just better!"). It received investment from Rocket Internet, the investment firm run by German entrepreneurs the Samwer brothers.
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