I would not have thought there would have been that many.
I presume you are talking of current models that are sold by two "unconnected" companies like the Italeri European Trucks which are also sold as Revell, albeit with minor differences to their Italeri release. I am also not that unconvinced that the Italeri Hummers are based on the Tamiya moulds as the models do appear very similar (this from memory I must admit), Revell also getting in on that act!! As opposed to connected companies like Revell and Monogram or AMT, ERTL and Matchbox (though of course with the demise of that company things changed a little) also Airfix and Heller.
Revell also seem to release other peoples models in their own boxes. I believe they currently have some Hasegawa aircraft in their catalogue and I believe their Lancia 037 Rally car is a re-decalled Hasegawa kit. Also some of the current Revell range are re-issues of some of the old Matchbox kits. The Revell Shackleton even is a re-issue of the 1960's (I presume) Frog kit. On the subject of Frog kits, Novo in Russia release a good number of them on the demise of Frog. Revell have also release a few Protar car and bike kits in various scales.
I think I remember a Frog model of an old open wheel racer which I suspect had its origins with AMT. I believe there were a number of car kits they released which had that source (we are definitely talking 1960's here so the memories are a little dim to say the least).
A Europeam Model magazine Scale Models International will more ofter than not list original manufacturer in the more detailed listings of some of the new releases.
I suppose a recent example of pure reboxing by another company would be some AMT 1/43 scale Truck kits which are currently available in Europe as Heller kits.
A defunct company IMC made some very good kits in the 70's. Some of their models were re-issued by Testors and a VW Beetle they made was re-issued by Union of Japan (I have that version of the model).
Some of the Airfix 1/24 car models are reboxed Japanese models (I think some were of Gunze Sangyo origin, though I am not 100% sure).
I am sure there must be others, but what exactly are you after? Are you after military models or just models in general? I suspect that you will find this a fairly massive task. I was surprised how much I came up with as I was actually writing this reply. I expect I will come up with some more if I am not careful!! At least I may jog some other peoples memories.