GParted is one of the best replacement for Partition Magic and other commercial software, since is available for all major operating systems.
Is an open source and completely free program that allows to manage partitions and organize your space on your hard drive. It runs from boot, when operating system starts.
You can create new partitions, resize an existing one, delete partitions, change label and more.
Is working with all types of hard drives, flash USB devices, RAID. Supports 32 and 64 bits platforms and as file system types covers a wide range such as NTFS, FAT, EXT, HSF and many more.