QGIS - QGIS is a desktop geographic information system, or GIS.
MySQL - The world's most popular open source database
Bentley Map - Bentley Map is an engineering-accurate, 2D/3D desktop GIS that provides infrastructure professionals with the right geospatial tools to create, maintain, analyze and share spatial information.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
SAGA GIS - SAGA - System for Automated Geoscientific Analyses - is a Geographic Information System (GIS)...
SQLite - SQLite Home Page