• openstreetmap.org (without marker)
• OpenTopoMap
• OpenStreetBrowser

• Historic Place (Geschichtskarte)
• OpenHistoricalMap
• 10 Years OpenStreetMap (only history of OSM)
• USGS TopoView

• OpenCycleMap.org
• Bicycle-Photomap (strict bicycle topic on the pictures)
• cycling.waymarkedtrails.org

• OpenSeaMap.org - the free nautical chart (worldwide)
• OpenNauticalChart.org - the free nautical chart (fork of openseamap)
• FreieTonne.de

• Hike & Bike Map
• Lonvia's Hiking Map - Marked Hiking Routes of the World
• 4UMaps.eu : Topographic outdoor, hike and mountainbike map
• TopOSM (USA, lower zoom levels only)
• Reit- und Wanderkarte (Germany, Austria, Switzerland)
• Israel Hiking Map (Israel)

• Runners Map

• OpenSnowMap
• XC Trails featureing one specialized map for cross country skiing (in German GUI called "Loipen") and one for alpine style ski touring

• ÖPNVKarte.de
• openptmap.org
• openrailwaymap.org
• TRAVIC Transit Visualization Client
• map.xiala.net (Switzerland)
• Metro & Tram, Railways, Railway electrification, Railway tracks (itoworld.com)

• OpenStreetMap Americana
• car parking (itoworld.com)
• highway lanes (itoworld.com)
• speed limits (itoworld.com)

• Open Infrastructure Map

• OpenFireMap.org

• Administrative boundaries (itoworld.com)
• admin levels (openstreetmap.fr)
• admin levels (openmapsurfer.uni-hd.de)
• OSM-boundaries

• wheelmap.org a map for wheelchair accessible locations

• http://mobilemap.petschge.de/map.php?lat=44.85&lon=1.516667&zoom=14 (optimized for small screens, e.g. mobile phones)

• Humanitarian Layer at openstreetmap.org

• geocaching.com
• opencaching.de a map of geocaches listed at Opencaching.de

• Wikipedia-Layer in English, German, Spanish, French, Italian, Japanese, Dutch, Polish, Portuguese, Russian, Swedish, Turkish, Chinese, Icelandic, Catalan and all other languages.
• Wikimedia Commons
• Wikipedia cluster and heatmap

• Open Source Routing Machine (OSRM)
• OpenRouteService.org
• GraphHopper.com
• yournavigation.org
• komoot.de

• http://opensciencemap.org
• F4map
• www.osm2world.org (only Germany)
• www.osm-3d.org
• OSM Buildings

• mapofthedead.com

• poitools
• Check Map Features via Query-to-map
• Streetlist beta
• Post- und Telefonkarte
• LinkedGeoData maintained by University of Leipzig
• openpoimap.org to show a large collection of user selectable poi - includes option to define your own. (wiki is here)
• neis-one.org Statistiken zu OSM-Edits und zu OSM-Problemen
• overpass-turbo Abfragen zu OSM-Map-Objekten

• Osmose
• Geofabrik OSM-Inspector
• Geofabrik Map Compare (side-by-side)
• Transparent Map Compare (sautter.com)
• OpenStreetBugs
• OpenStreetBugs-Skobbler
• autobug map
• Keep Right!
• DupeNodes
• OWL: Osm Watch List forever week day info
• FIXME, Adresses, Layers (itoworld.com)
• OSM-node-density
• Fehlende Straßennamen und Hausnummern / falsch gemappte Gebäude: qa.poole.ch
• Verwaiste Wege/Knoten: Orphan Ways
• Check von Adressen und Straßennamen: addresses.lorenz.lu
• Check auf Adressfehler osm-suspects

• last 7 days by type
• last 7 days by edits
• last 90 days by type
• last 90 days by edits
• http://labs.geoxp.com/osmdiff-48h.html Changes in nearly the last 48 hours

• your default editor
• Potlatch
• iD
• JOSM (running over remote-control, so JOSM must running in the background)

• OSM Amenity Editor
• osm.cdauth.eu
• WebMapService via http://osm-wms.de/

• GPS-Tracks by Eric Fischer

• Reverse search
• Name search

• OpenTopoMap.org

• www.openstreetmap.by

• maakaart.ee

• FranceTopo.fr
• openstreetmap.fr

• www.openstreetmap.de

• www.osmapa.pl

• OpenMap.ro map with points of interest, routing and public transport.

• openstreetmap.es Spanish open street map community incl. updates and tutorials

• openstreetmap.ch

• www.openstreetmap.ua
• www.nadoloni.com

• OpenStreetMap Americana

• www.openstreetmap.ru

• openstreetmap.in

• osm.org.il/IsraelHiking

• www.openstreetmap.jp

• Polar Viewer

• http://toolserver.org/~osm/styles/?lat=44.85&lon=1.516667&zoom=14

• khtml.org

• m(arker).osmtools

...