The OFIQ (Open Source Face Image Quality) is a software library for computing quality aspects of a facial image. OFIQ is written in the C/C++ programming language. OFIQ is the reference implementation for the ISO/IEC 29794-5 international standard; see https://bsi.bund.de/dok/OFIQ-e.
Before using OFIQ or distributing parts of OFIQ one should have a look on OFIQ's license and the license of its dependencies: LICENSE.md
The best way to get started, is to read OFIQ's reference manual: see doc/refman.pdf. The manual contains a documentation on how to compile and run OFIQ.