Free COBOL Compilers
The compiler is usable freely but must comply with "GNU General Public License" licence terms.
The TinyCOBOL project is a COBOL compiler being actively developed by members of the free software community.
GNU Cobol (formerly OpenCOBOL)
GNU Cobol (formerly OpenCOBOL) is a free and open-source COBOL compiler. cobc translates COBOL to executable using intermediate C sources, providing full access to nearly all C libraries.
Cobol For GCC - a GNU project
COBOL For GCC is a project to produce a free COBOL compiler compliant with the COBOL 85 Standard, integrated into the GNU Compiler Collection (GCC).
COBOL12 is a 16-bit COBOL compiler that runs under DOS or Windows. The compiler was originally based on Ansi74, but has undergone many changes since its inception. It does not include some features such as SORT and STRING, but it has many non-standard features included.