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It is not a good idea to display all data on the map (especially if you have more than 100 000 objects) as point. In openlayers there are heatmap(http://www.patrick-wied.at/static/heatmapjs/) and cluster map (http://openlayers.org/en/v3.6.0/examples/cluster.html). I recommend using one of them In my software I create own "interpolation image" with data


Depends on what you consider "visualisation". You can just use QGIS. Load the coordinates as separated text layer or whatever format you have. Then use the OpenLayers plugin to get a background OSM layer. Or if you actually do have world-wide data, better use Natural Earth vector data to show it in an appropriate projection. http://qgis.org/ ...


since I'm from the debian/ubuntu universe it is called differently at centos/rhel... have a look at http://wiki.osgeo.org/wiki/Enterprise_Linux_GIS#How_to_enable_the_ELGIS6_repository at centos it is called grass-devel-* (see http://elgis.argeo.org/repos/6/elgis/x86_64/) remark: 6.4 is the old stable branch. I recommend 7.0 -> much more fun.

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