Foreigner series

Cherryh, C. J. Foreigner. New York: DAW/Penguin Books, 1994. 10th Anniversary Edition, DAW Books, 2004.

In Wikipedia summary:

The Foreigner series opens with the failure of a starship. A brief preamble to the first book describes a system failure that leaves the starship Phoenix stranded in some far-flung reach of space, without any idea of how to get home [...]. The habitable environment that the damaged starship can reach is the homeworld of the atevi, a green and living world, already populated by aliens with steam age technology. [...]

— a technology John J. Pierce places "at a level comparable to medieval Japan" ("Retrofitting Humanity" in ms, p. 32). Part of the early action involves "the work of [cultural] understanding and technology transfer."[1]

Series[2]

Foreigner, DAW Books, 1994.
Invader, DAW Books, 1995.
Inheritor, DAW Books, 1996.
Precursor, DAW Books, 1999.
Defender, DAW Books, 2001.
Explorer, DAW Books, 2002.
Destroyer, DAW Books, 2005.
Pretender, DAW Books, 2006.
Deliverer, DAW Books, 2007.
Conspirator, DAW Books, 2009.
Deceiver, DAW Books, 2010.
Betrayer, DAW Books, 2011.
Intruder, DAW Books, 2012.
Protector, DAW Books, 2013.
eacemaker, DAW Books, 2014.
Tracker, DAW Books, 2015.
Visitor, DAW Books, 2016.
Convergence, DAW Books, 2017.
Emergence, DAW Books, 2018.
Resurgence, DAW Books, 2020.

RDE, with thanks to JJP, 30June20