InteProxy Security for Spatial Data - InteProxy is a tool that adds secure transmission via SSL a well as user authentication to those OWS-based applications that that do not support these security features.
JCS Conflation Suite (JCS) is an API and set of interactive tools which perform conflation on spatial datasets.
JEEPS Library is intended as both a library and a development system for GPS and related software. It consists of documented C functions for communication with GARMIN GPS devices and for post-processing of the information received.
JUMP Unified Mapping Platform (JUMP) is a GUI-based application for viewing and processing spatial data. It includes many common spatial and GIS functions. It is also designed to be a highly extensible framework for developing and running custom spatial data processing applications.
KFlog is a soaring-pilot-software for KDE. It is used to display, analyze and evaluate flights logged with a gps-logger. Different values of a flight-point can be displayed in the map, like altitude, cycling, speed and vario. There is a maproom-page where you can download Aeronautical, Ground- and terrain- and additional data for maps.