I've done a bit of hacking on charcoal and mupdf lately. I reworked the rendering of charcoal and mupdf to incorporate littlecms color management. A lot of bugs were removed in the process, but some new ones were added as well... for some reason ICCBased color spaces don't work, nor does CalGray. I suspect that I am just not using littlecms correctly.
FOAF updates: Trust rankings are now exported, making the data available to other users and websites. An external FOAF URI has been added, allowing users to link to an additional FOAF file.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!