Six of the best free Android apps for geeks

From an RPN-capable calculator to a free SSH client

There are a lot of things about Google's Android operating system that appeal to geeks. It's open source, it offers a lot of flexibility when it comes to customising your handset, and, despite not yet matching the iPhone when it comes to the number of apps available, the Android Market continues to grow. We've compiled six great geeky apps that you might want to consider adding to your arsenal. Best of all, they're free.

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