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License: WTFPL
Platforms: Windows, macOS, and Linux
Language: English
Source code: http://svn.openstreetmap.org/applications/editors/potlatch2
Programming language: ActionScript

Halcyon is the ActionScript 3 rendering engine for OSM data used by Potlatch 2 and Potlatch 3.

Halcyon can be used to read from many different sources of OSM data - XML connections to live OSM servers, read-only .osm files and even AMF connections. Halcyon also supports Vector Background layers, which Potlatch 2 uses for shapefile and GPX display, as well as tiled image backgrounds.

Halcyon uses MapCSS for specifying stylesheets, allowing you to control the display of the data in your application without needing to recompile halcyon.