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QNetMap is the library for displaying the map and the objects on it
...The map data can be downloaded from the Internet or from the disk cache.
User's own raster maps can also be used.
QNetMap supports layers so you can mix maps from different servers.
To enrich the map presentation you can draw your own objects in the given coordinates.
The development of the library was supported by "Sintels" LLC (ЗАО "Синтелс" -
http://sintels.ru) and OJSC "T8" (ОАО "Т8" - https://t8.ru). Written by Sergey Shumeyko and Sergey Vasyutin.
The alio library can be dynamically pre-linked to existing executables and replaces file IO (i.e. calls to glibc's IO functions). This allows to gather statistics about IO, create IO trace files, or even implement a different IO behaviour (e.g. use separate IO servers to handle IO).