I began developing Cloudy at the Institute of Astronomy, Cambridge, in August 1978.  It is named after the famed East Anglian weather.  Some links:

• Information about Cloudy
• nublado.org, the project website, where you can download the source, data, and documentation
• Cloudy Workshops, where participants can learn about spectroscopy and Cloudy.  The workshop began a world tour in Lexington in 2012, visited Belfast (NI), Durham (UK), Leiden (Netherlands), Warsaw (Poland), Pune (India), Shangdong (China), and ended in July of 2017 in Tonantzintla (Mexico).  A world tour map is here.  Later workshops have been held in Belfast (NI), Chiang Mai (Thailand), Lexington, and Cambridge. 
• An article UK PR did on the Cloudy project in late 2018
• The NASA ADS list of the major review articles on Cloudy.

Textbooks and reviews