The service Restream.io allows split original stream to other services. See how to stream to Restream.io by JustBroadcaster.
Open JustBroadcater and press On Air and select RTMP Mode
It opens browser page for streaming. You need fill two fields.
Log in to Restream.io, found RTMP URL field and Stream Key and copy them to JustBroadcaster and press START:
After START you can see your stream in Restream.io dashboard: