Here's a quick list of a few free and open source GIS programs, related software packages and libraries, and their version numbers.
GRASS GIS 7.0.0 LTS
QGIS 2.8.1 Wien LTR
Remote Sensing/Image Processing
Orfeo Toolbox 4.4
Opticks Image Processing 4.12.0
Fusion LIDAR 3.42
LAStools (March 2015)
Web map development
Open Layers 3.4
|QGIS Visual Changelog makes learning about new features a breeze!|
Lastly, updates for paid software are also important and sometimes may require you to update your license agreement, depending on when you purchased the software. Additional fees may apply.