FOSSer

From FOSS +‎ -er.

FOSSer (plural FOSSers)

1. (computing, informal) A user or advocate of free open source software.

• http://www.mail-archive.com/[email protected]/msg00020.html

  But would it be fair to conclude that FOSSers have been paying too much attention either to themselves or to the devils from Redmond, and not enough attention to their potential customers?

• sofers