A very simple Python front-end to the Linux Folding@home client. Doesn't give you much, handy for doing a quick status check if you don't feel like setting up an SSH tunnel so you can look at the web control panel.
A canonical list of HTTP status codes (and what they're used for in a RESTful context), what they mean, and how they should be used.
GPS.gov's directory of status reports and operational directories.
Navigation Center RSS Feeds for Local Notices to Mariners (LNMs) for each Coast Guard District. These feeds are update automatically as soon as we publish the latest LNM for each districts.
Currently monitored by Tripwire.
A site that keeps track of the statuses of various Tor network markets. No RSS, no API, can probably scrape it.
Daily reports about the global bgp routing table.
The Wikipedia page describing all of the known more-or-less standard HTTP status codes. Useful for people developing web applications.
3697 links, including 185 private