RepresentMap!

Maps gives you turn-by-turn spoken directions, interactive 3D views, and Flyover. All in a vector-based interface that scales and zooms with ease.Maps also gives you guidance to take public transportation and helps you explore your surroundings, so you always know what's around you.

Modest Maps is a small, extensible, and free library for designers and developers who want to use interactive maps in their own projects. It provides a core set of features in a tight, clean package with plenty of hooks for additional functionality.

GMap.NET is great and Powerful, Free, cross platform, open source .NET control. Enable use routing, geocoding, directions and maps from Google, Yahoo!, Bing, OpenStreetMap, ArcGIS, Pergo, SigPac, Yandex, Mapy.cz, Maps.lt, iKarte.lv, NearMap, OviMap, CloudMade, WikiMapia, MapQuest in Windows Forms & Presentation, supports caching and runs on windows mobile!

MapBox makes it easy to design beautiful custom maps, and fast to integrate them into websites and mobile applications using Open Street Map data.

Navit is an open source car navigation software for Linux, Windows systems and portable devices. It will display your position on a map (in bird-view mode or as a 3D "visualization") from GPS sensor data, and can provide precise route calculation, touch screen functionality and supports Points of Interest (POI), which can be extended via an easy to use plugin system. Unlike other navigation systems, Navit maps are dynamically generated in real time from vector data. Navit is completely offline and works without an internet connection. Navit respects your privacy and does not track your position. »

Get where you need to go with the MapQuest GPS and navigation app. Whether it’s using turn-by-turn voice navigation for walking or driving directions, booking a ride through a variety of transportation options (including Uber and car2go), or using local transit*, MapQuest has the tools you need to navigate your world how you want.

TransforMap works towards an online platform for you to visualize the myriads of alternatives to the dominant economic thinking on a single mapping system.

An online map built specifically for travel. Great at finding amazing places, planning trips and routes, and much more.

WikiMapia is a privately owned, online map and satellite imaging resource that combines Google Maps with a wiki system, allowing users to add information, in the form of a note, to any location on Earth. Users may currently use this information for free. Inspired by the success of Google Maps and Wikipedia, two Russian Internet entrepreneurs Alexandre Koriakine and Evgeniy Saveliev launched the website on May 24, 2006. It now has over 15,000,000 places marked. Although registration is not required to edit or add to WikiMapia, over 1,100,000 users from around the world currently are registered. All content uploaded by users is currently made available under Creative Commons license for non-commercial use through WikiMapia API. Approximately 1,000 new users register everyday. »

RMaps is the navigation tool. You can use RMaps like online map viewer for some popular maps. And like offline map viewer for your own maps created on the PC.