
This app and Tuxera NTFS claim to offer better reading/writing performance than the standard NTFS-3G + Macfuse/OSXFuse setup, though I haven't verified this myself.
HOW DO I WRITE TO NTFS ON MAC MAC OS
For instance, Paragon NTFS is a simple $20 app that enables writing to NTFS drives on Mac OS X, with no hassle involved. NTFS-3G normally works pretty well on Lion, Mountain Lion, and Mavericks with OSXFuse, but there are paid options as well. These post-Snow Leopard compatibility issues affect all free NTFS enablers, including apps like iNTFS and NTFS Mounter. To fix these errors, you'll have to install this patch for NTFS-3G.


However, even with OSXFuse, NTFS-3G does not work fully in Lion, Mountain Lion, or Mavericks you will still get mounting errors every time your computer boots.
HOW DO I WRITE TO NTFS ON MAC MAC OS X
Unfortunately, development of the Macfuse driver has stopped, so there will likely never be any official support for newer versions of Mac OS X. In Mac OS X Lion, Mountain Lion, and Mavericks, you'll instead have to install the OSXFuse driver, a replacement for Macfuse (be sure to checkmark the "MacFUSE Compatibility Layer" when running the OSXFuse installer). Once you've installed both NTFS-3G and Macfuse, you'll be able to write files to your Windows hard drives flawlessly. You need to install the Macfuse driver as well, for NTFS-3G to work.

NTFS-3G is a Mac app that enables reading & writing to NTFS drives on Mac OS X Snow Leopard for free.
