Department of Justice: Entirely offline, including Bureau of Justice Statistics.
We the People: A read-only API for the sake of accessing petitions submitted to the White House. Any petitions that were open as of Oct. 1 "will have their deadlines extended" to compensate for the shutdown.
Government APIs that are partially or entirely working
U.S. Geological Survey: Offline, but many data sources relating to natural hazards or things "necessary to protect lives and property" -- such as disease maps -- are still online.
IT Dashboard: The data feeds for the website "enabling federal agencies, industry, the general public, and other stakeholders to view details of federal information technology investments" are up and running. Data is current as of Aug. 30, 2013, however (it's updated only biannually anyway, though).
Homeland Security/TSA: The MyTSA Web Service API still appears to be working, since it's a security-related government function.
Bureau of Transportation Statistics: Most historical data still appears to be available, but data updates do not appear to be taking place.
Department of Defense: >Unsurprisingly, the list of DoD APIs and Web services all seem to be up and running.
National Vulnerability Database: Provided by the NIST, this database is still queryable, although it's not being updated during the shutdown.
U.S. Energy Information Administration: Officially a beta product, its data sets still appear to be accessible, although it's not clear if they're still being updated.
U.S. Patent and Trademark Office: The patent and trademark databases are still online and can be queried.
This story, "Where you can't (and can) get government data during the shutdown," was originally published at InfoWorld.com. Get the first word on what the important tech news really means with the InfoWorld Tech Watch blog. For the latest developments in business technology news, follow InfoWorld.com on Twitter.