It's been a while, but I've added MCSlice to the github repository.
This was an interesting diversion, using descriptions of the minecraft map file format from Minecraft Wiki to write a decoder and viewer (there are plenty of minecraft map decoder projects on github, but I didn't exactly go looking for them).
One of the data files (blocks.json) came from MCObj, which was also my first exposure to the Go language.
There is a now a branch on the GitHub repo page for handling the Anvil file format. It's still a bit rough and ready, but it shows great improvement from its predecessor!