During spare moments at the Ubuntu Below Zero conference (they're a very friendly bunch of people) I've been hacking on my little spam training tool, written in Mono and Gtk#.
It's been a long time coming, but 0.1.4 fixes a niggling little bug that's been annoying me for a while; in previous releases you couldn't tell if the ham/spam training commands completed successfully. I've added an extra dialog box to alert you if there was a problem. I've also added tooltips to make it more obvious how to train on a message.
You can get it from here: http://spamtrainer.sourceforge.net/
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!