AdverTool is an online tool which integrates the most popular advertisement networks (such as Microsoft adCenter, Google AdWords, Yahoo! Search Marketing, Facebook Ads, ...) to ease the management of online marketing campaigns. More information: http://advertool.org

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