Multiple operating systems on the same PC and Large Drives

I've always had multiple OS on my Computer. Using MBR and Boot managers i was able to do this until now. But today i've replaced my Pc with a new one that have a large HDD , 5TB. Reading on inteet i've found that using MBR it's not possible to create partitions beyond the 2.2TB , so i can't manage all my drive's space. So i thought to use GPT/UEFI scheme. But now i have problems because it seems that the boot managers available on the market ( as far i know ) doesn't support booting from UEFI/GPT . I've contacted with the TerabyteUnlimited company that has the Bootit boot manager that i've used until now , but they told me the same thing that doesn't support booting from Uefi/GPT.

So what can i do to have multiple OS installed on my pc but also to use all my HDD's space ?

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