A JOSM plugin that lets you view OpenStreetCam  images from within JOSM.
To download, go to the Plugins preference pane in JOSM and look for the plugin named 'OpenStreetCam'. Update plugins, and restart JOSM.
Direct download link (via josm.openstreetmap.de)
Note: The OpenStreetView plugin is deprecated and was replaced by the OpenStreetCam plugin. New features will be available in the OpenStreetCam plugin.