1) Windows-only freeware 
Metapad is an open source text editor for Microsoft Windows 9x/NT/XP/Vista/7, developed by Alexander Davidson since 1999. The aim of Metapad is to provide a near drop-in replacement of Notepad in Windows. Metapad was distributed as freeware for the first ten years of its existence. On March 20, 2009, the 10th anniversary of its initial release, th...