GPX Editor - Load, modify and save your GPX 1.1 files.
QGIS - QGIS is a desktop geographic information system, or GIS.
gpx.studio - View, create, edit and combine GPX files online to correct your activity data or design new awesome routes.
GRASS GIS - GRASS GIS is a free Geographic Information System (GIS) software used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization.
GPSies - With GPSies you can view and download tracks which have been recorded by a GPS device.
ArcGIS - ArcGIS software is a data analysis, cloud-based mapping platform that allows users to customize maps and see real-time data ranging from logistics support to overall mapping analysis.