Osmosis is a command line Java application for processing OpenStreetMap data. The tool consists of pluggable components that can be chained to perform a larger operation. For example, it has components for reading/writing databases and files, deriving/applying changes to data sources, and sorting data, (etc.). It has been written to easily add new features without re-writing common tasks such as file and database handling.

Some examples of the things it can currently do are: Generate planet dumps from a database Load planet dumps into a database Produce change sets using database history tables Apply change sets to a local database Compare two planet dump files and produce a change set Re-sort the data contained in planet dump files Extract data inside a bounding box or polygon