Open-source JavaScript library for mobile-friendly interactive maps
Interactive, thoroughly customizable maps in the browser
Open Source Routing Machine - C++ backend
GPS track editor for editing tracks and planning (multiple) day tours
Minimalistic wide-open GPS-locator/tracker
Braille & ASCII world map renderer for your console
Simple Scientific Workflow System for CAGE Analysis
A tile-based map viewer with support for GPX files.
Using PHP-CLI to parse NMEA data to generate depth maps with GD
See you and your friends on a map
Tile Cache Server
A map-based discussion forum ("argumentation map")