libtap made it to version 1.0 the other day, and there don't seem to be too many embarassing mistakes, so...
libtap is an implementation of the Test::Harness protocol for reporting test successes/failures (ok, not ok, skip, TODO, etc) in C, making it ideal for when you need to write test cases in C (Perl not available, Inline::C not available, that sort of thing). Full documentation is included.
More information, including links to the tarball, MD5 checksums, read-only access to the Subversion repository, and the bug/feature ticket system is at my Trac site.
This has only been tested on FreeBSD 5.x and 6.x at the moment; if you're on those systems then you can use ports/devel/libtap for ease of installation. Tests on other systems (and tickets reporting issues / patches to fix them) would be very welcome.
