This Mapbox SDK provides C++ headers that support rendering geodata into vector tiles and rendering vector tiles into images. It is a Mapnik implementation of the Mapbox Vector Tile specification. Vector tiles make large maps quickly while offering full design flexibility. They are the vector data equivalent of image tiles for web mapping, that applies the strengths of tiling, developed with caching, scaling and serving map imagery rapidly in mind. Mapbox is an open source mapping platform for developers that provides tools for Maps and location data, Location based games, VR and AR applications and more.
You-Tracker.com offers a free web service that allows websites to resize images to a specified height and width. Programmatic access to the service comes through the You Tracker Image Resizer API. The service allows users to preserve image quality percentage, aspect ratio, and can prevent enlargement. The API eliminates the need to manually resize images and users need not wait for images to load.