Linux game database - This is a Linux Game Database, primarily for native Linux games that are beyond the planing stage...
On-Screen Ruler - lightweight, free, semi-transparent ruler
LinuxGames - News about Linux games.
Bluegrams Screen Ruler - A lightweight and configurable ruler tool for Windows Desktop.
Slashtime - Tracking news about open-source games with free content and related development.
Meazure - What are the dimensions of that image? How big is this window?