NTFS read write – Mac OS X mountain lion

To Read/Write/Format NTFS from Mac OS X, here are some alternatives:
For Mac OS X 10.4 or later (32 or 64-bit), install Paragon (approx $20) (Best Choice for Lion)
For 32-bit Mac OS X, install NTFS-3G for Mac OS X (free) (does not work in 64-bit mode)
For 64-bit Snow Leopard, read this: MacFUSE for 64-bit Snow Leopard
Some have reported problems using Tuxera (approx $36).
Native NTFS support can be enabled in Snow Leopard and Lion, but is not advisable, due to instability.