ArcGIS (arcgis.com) is a proprietary GIS software platform from ESRI. It is the canonical software for manipulation of ESRI Shapefiles. Note: Through the ArcGIS for Home Use Program, users can purchase a non-commercial license for ArcGIS that includes many extensions for US$100/yr.
ArcGIS Editor for OSM
ArcGIS Editor for OSM provides the ability to import, export and edit OSM data via a free add-in for ArcMap.
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ArcGIS Haiti Earthquake Response
Accessing OpenStreetMap data within ArcGIS to support the Haiti Earthquake Response is article details various options for bringing in OpenStreetMap (developed in relation to Haiti mapping, but applies worldwide)
ArcGIS OSM importer
ArcGIS can import .osm files using a python script called "OpenStreetMap Loader" (Version 1.1 by Dominic Stubbins) that doesn't use an XML parser! The script can be downloaded from arcscripts.esri.com