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GraphHopper Maps - https://graphhopper.com/maps/
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GPX Viewer with colored elevation - http://maplorer.com/view_gpx_fr.html
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GPS Visualizer - http://www.gpsvisualizer.com
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Graph My Run - http://www.graphmyrun.com/graph.html
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GPS track log viewer - http://gpx.tomaskafka.com/
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GPXTools for fixing GPX files (mainly compute elevation)- http://www.visugpx.com/outils/
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Tools to convert formats - http://geojson.io