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It’s been less than a week since Google released the source code for Android 4.1 Jelly Bean — and independent developers have been hard at work, bringing Google’s latest software to existing devices including the Acer Iconia Tab A500 and Amazon Kindle Fire.

Now there are early builds of Jelly Bean for a few more devices, including one phone that’s been around since 2009.

• HTC HD2: This phone was originally designed to run Windows Phone software, but it’s been hacked to run nearly every version of Android, plus a few other operating systems including MeeGo and Ubuntu. The initial build of Android 4.1 is still a work in progress. The camera doesn’t work, nor does video playback. But it’s still pretty impressive to see.
• Asus Transformer Pad TF300T: This tablet features a 10.1 inch, 1280 x 800 pixel display, an NVIDIA Tegra 3 quad-core processor, and 1GB of RAM. It’s the cheaper alternative to the Transformer Prime, but it’s still a pretty great tablet in its own right. While hardware-accelerated video playback and camera features aren’t working yet, and audio is funky, Android 4.1 for the tablet already supports WiFi, Bluetooth, and more.
• Barnes & Noble NOOK Tablet: The latest Barnes & Noble tablet features similar hardware to the Kindle Fire, so it’s not surprising to see Android running on this tablet so soon after it was ported to Amazon’s hardware. But not everything works yet. Audio doesn’t work yet, nor does hardware video acceleration.
• Acer Iconia Tab A100: Acer’s 7 inch tablet gets its first taste of Jelly Bean. At this point most things work, but sound is a little iffy and the camera and gallery apps are broken.

All three projects are in their early phases, with some features not yet supported. But it’s only been a week since Google released the Jelly Bean source code. I suspect we’ll see some of the kinks worked out in the coming weeks — as well as Jelly Bean ports for even more phones and tablets.

It’s likely that we’ll also see official updates for some of these devices. I wouldn’t be surprised to see Asus release its own build of Android 4.1 for the TF300T, for instance — but it could take months for that software to arrive. And we’ll probably never see official updates for devices like the Kindle Fire, NOOK Tablet, ot HTC HD2 which were never really intended to run this kind of software.