International interferometry organisations

• IAU commission 54 on optical and infrared interferometry. This is the go-to site for information on interferometry and provides links to many other useful pages.
• The European Interferometry Initiative (EII)
• You can subscribe to the OLBIN (Optical Long-Baseline Interferometry News) forum mailing list for updates on interferometry.

Data reduction/model fitting/image reconstruction software

See the IAU C54 software page for a fairly comprehensive list. Additional items not on that page include:

• mfit: Model Fitting Software for Optical Interferometry