The Geographic Resources Analysis Support System, commonly referred to as GRASS GIS, is a Geographic Information System (GIS) used for data management, image processing, graphics production, spatial modeling, and visualization of many types of data. It is Free Software released unter GNU General Public License (GPL).
GRASS 5.0.3 adds bug fixes, not features. There are no further scheduled releases in the 5.0.x series, but exceptions might be made for more bug fixes.
The next planned stable release is 5.4.0. The corresponding development series 5.3.x has several new modules, and features substantial improvements in projection capabilities and visualization ("nviz").
Major changes to the vector engine and attribute management system have been implemented in the 5.7.x line, which will become the next major production series as 5.8.x.
We are always looking for both testers and developers to help us maintain and accelerate this development cycle.