HSLayers is yet another OpenLayers & ExtJS based mapping framework. It’s development has been started in 2007 and is still provided mainly by Help Service - Remote Sensing. HSLayers is released under GNU/GPL. Currently, 3.0 development branch is the actual.
Directory structure respects the structure of OpenLayers (Control, Layer, Format etc.).
Although HSLayers is Client-based library, several server-side components are needed:
Basic helper scripts those scripts are needed for basic HSLayers funcionality, for communication with remote servers, for storing some temporary data etc.:
In order to be able to work with HSLayers, you should have basics in OpenLayers and ExtJS libraries.