Open Source Geospatial Foundation
MapGuide Open Source is a platform for developing web mapping applications.
It is an advanced address book program for managing contacts.
Creates mind maps based on rich examples and templates.
Bible Maps has 13 Bible maps which covers almost all major places in Bible.
Remere's Map Editor is a map editor coded in C++ for the OpenTibia Project.
This is a cross-platform Java Visual Traceroute and packet sniffer.
Jackie Ng, Kenneth Skovhede
MapGuide Maestro is an open source map authoring tool for MapGuide.
D2D Map Editor
D2D Map Editor is an open source project written in C#.
Aciqra is an open source virtual sky map and planetarium.
Map any your currently open Visual Studio code files.
TEdit is a stand alone, open source map editor for Terraria.
It enables you to open Web Map Context (WMC) files directly in ArcMap.
qMetro is an open source vector metro (subway) map for calculating routes.