We are working on upgrades to the existing LabSat hardware which will allow Glonass and Galileo signals to be recorded, replayed and simulated alongside the normal GPS signal.
Multi Constellation Testing with LabSat
The screenshot shows the output of a Glonass enabled GPS Engine (Javad) tracking 5 Glonass satellites and computing a location fix from the RF data coming out of a modified LabSat in our test labs.
The new upgrade will be able to output all three constellations, which will enhance LabSat’s capabilities even further. The release date and prices will be announced in here and on our website.
LabSat :: Blog 
What do you have to sell for multi const loggers?
http://www.labsat.co.uk. Our latest multi-constellation record & replay system LabSat 3 Wideband is able to record up to 20 signals simultaneously, on multiple frequencies with a bandwidth of up to 56 MHz.