Backup Bouncer — software to test how effective your backup tools are: you copy files to a test area by whatever means you like, then run this tool to see whether permissions, flags, owners, contents, timestamps, etc. are preserved. (via Joshua Schachter)
reVerb — open source (GPLv3) toolkit for learning triples from text. See the paper for more details.
The Internet of Things That Do What You Tell Them: Cory Doctorow passionately explains how computers are already entwined in our lives, which means laws that support lock-in are much more than inconveniences.