Vic-20 soundchip emulator by Aleksi Eeben. Featuring music by Aleksi, Britelite, Viznut, Mermaid and myself. Also contains some historical documents. 
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Nomad's Land
Very nice prod, though I'd have to echo what's been said on csdb: The sound is somehow not gritty enough.
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It'd probably be difficult to get it grittier because the Vic has a couple of extra quirks that would be hard to simulate, namely:
1) Distortion caused by capacity overload of the sound space when the volume is > 10. (Might even be an incorrect DC offset, dunno) You could do something with the 6581 filters maybe, but it would probably be too muffled.
2) The noise generator's 'resonance' overtone, you'd need a much wider resolution of samples than the 8 levels in this emulator. (Amusingly the arcade machine Gorf has a similar sounding noise channel)
Also it's a frame-based emulator so Viznut's Waves and digis are out.
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Nomad's Land
Thought so. Nevertheless, Aleksi did a good job, imo.
The capacity overload issue would be interesting to dig more into by itself, I think. Seems it's not exactly consistent over time, at least on the machine I'm currently using.