OIFITS is the standard data exchange format for Optical Interferometry. It is based on the Flexible Image Transport System (FITS). OIFITS files include data tables for storing interferometric observables, including squared visibilities and closure phases.
A Data Exchange Standard fro Optical (Visible/IR) Interferometry - Pauls, T. A., et al. Pub. Astron. Soc. Pacific, 117, 1255 (2005)
OIFITS 2: the 2nd version of the data exchange standard for optical interferometry - Duvert, G., et al. Astron. and Astrophys., 597, 8 (2017)
OIFITSlib is a C library for input/output, merging, filtering and checking of optical/IR interferometry datasets in the OIFITS exchange format.
OIFITS Explorer is a software tool developed by JMMC to explore reduced interferometric data. The software can be used to make plots of the uv coverage, visibilities, and closure phases.