NITRO (NITFio, "R" is a ligature for "Fi") is a full-fledged, extensible library solution for reading and writing the National Imagery Transmission Format (NITF), a U.S. DoD standard format. It is written in cross-platform C, with bindings available for other languages.
nitf-c and nitf-c++ (as well as coda-oss) can now all be built as DLLs.