Open Source Routing Machine - C++ backend
Interactive, thoroughly customizable maps in the browser
GWC is a tile server and caching proxy written in Java
GPS track editor for editing tracks and planning (multiple) day tours
A low ram maps downloader to keep your ram free.
Open-source JavaScript library for mobile-friendly interactive maps
Minimalistic wide-open GPS-locator/tracker
Braille & ASCII world map renderer for your console
Flights, vessels, satellites and trackers realtime 2D/3D display
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
OpenStreetMap tile downloader
Tile Cache Server
A map-based discussion forum ("argumentation map")