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The early 2000s saw a Cambrian Explosion of form factors for mobile devices, and one of the most feature-rich phones of the time was the Danger Hiptop, better known as the T-Mobile Sidekick. [ashe] wanted to get the phone going again, which took some sleuthing .

While not advertised as such at the time, the Hiptop was primarily a client for web apps from the Danger servers. So, when Danger was shuttered, so were most of the phone’s features. [ashe] was able to track down the SDK for the device’s Java-based OS, but to get any programs running on an actual device, they needed a developer key.…