This looks like a great site. Thanks I'd do a lot of research on any of the Disk Management programs because if they mess up, you're likely to lose everything and could mess up the hdd. That's not to say some or all of them aren't good, I've never tried them, just research should help better insure you won't have problems.
I google partition manager find some freeware bellow:
paragon can't merge partitions.
easeus partition manager
I download from brother soft .It worked OK, but failed when i tried to merge partition. so i have to allocated the free space to another partition. Partition magic may merge two partitions which will cost you $69.95