It's not free, like the options below, but it's the best tool money can buy. Open source vector graphics package Inkscape is staggeringly powerful, and is the best free Adobe Illustrator ...
If you have extra time, Rock Climbing is worthwhile. Climbers flock to Joshua Tree from around the world to tackle the literally thousands of routes open to them. There are challenges for all ...
The Vector SIL Kit is an open-source library for connecting Software-in-the-Loop Environments. This README is intended to provide you with quick start on how to build the Vector SIL Kit. For ...