I need to resize NTFS and HFS+ partitions on a GPT/hybrid MBR SSD. Any suggestion?
HFS+: ONLY from the Mac (Disk Utilitity or terminal). Windows cannot handle HFS+ at all, and Linux can only shrink it.
NTFS is less critical, still the safest solution would be Windows.
If you have a spare disk at hand this would be the safest solution:
1 - In Linux: with gparted copy the partitions to that disk, leaving enough space after each partition you want to enlarge.
2 - Then, booting from Mac and from Windows resize the respective partition (probably, Linux does a good job enlarging NTFS as well).
3 - Check the contents (Finder, Windows Explorer, etc.) and structure of each partition (Disk utility, chkdsk, fsck, etc...)
4 - In Linux: with gparted copy the partitions to the disk where you want them to be. Up to this step you have nothing destroyed/overwritten yet.
5 - Still in Linux: in terminal use gdisk to make sure you have the hybrid GPT.
Without a spare disk you can use gparted in Linux to shuffle partitions. Even when booted from the same disk, all partititions but the active Linux system can be moved/resized, etc. (unmount swap if necessary).
To enlarge HFS+ have free space after this partition, but do the actual enlarging from within Mac OS.
Again, use gdisk (available for mac as well) for the hybrid MBR.
