ClustrMaps Widget vs. OpenLayers
Take a look at this side-by-side comparison of ClustrMaps Widget and OpenLayers.
At a Glance
ClustrMaps Widget
About ClustrMaps Widget
ClustrMaps widget is a visitor tracker, designed for general web and blog use.
OpenLayers
About OpenLayers
OpenLayers is an open-source JavaScript library for displaying map data in web browser.