GPX Editor - Load, modify and save your GPX 1.1 files.
OsmAnd - Global mobile map viewing and navigation for online and offline OSM maps
gpx.studio - View, create, edit and combine GPX files online to correct your activity data or design new awesome routes.
MAPS.ME - Fast, detailed and completely offline maps for mobile devices
GPS Track Editor - GPS Track Editor: Free Windows Application to Make GPS Tracks Better.
HERE WeGo - HERE WeGo - Maps - Routes - Directions - All ways from A to B in one