Open Source-y Gift Guide

Here's a handy list from Make, with a bunch of open source-y things, many of which have been mentioned before in these posts. Still, I'd like to single out the PortableApps Suite - happiness on a thumb drive:

PortableApps Suite (Standard Edition): ClamWin Portable (antivirus), Firefox Portable (web browser), Gaim Portable (instant messaging), OpenOffice.org Portable (office suite), Sudoku Portable (puzzle game), Sunbird Portable (calendar/task manager) and Thunderbird Portable (email client) and runs comfortably from a 512MB drive.

Installation and use are easy.