Scid: A Free Chess Database App
scid.sourceforge.net
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Welcome to the website for Scid ("Shane's Chess Information Database"), a chess database application for Windows and Linux operating systems. Scid is free but a donation (which can get you Scid on a CD-ROM with a high-quality million-game database) is enc