Accessing ArcGIS Server OGC WMS secured service (with token) is not accessible in any of the other COTS / Open source softwares eg. Apollo server, Geoserver, QGIS, etc. If the security is removed, we can access it. ,
Please suggest for the above.
ArcGIS tokens are an Esri specific construct and are not a part of the OGC spec. You'd have to use web tier authentication (basic/digest) if you'd like to use secured OGC services with the clients you mention.
See 'Securing OGC services':