Provides native Win32 open source ports and utilities
GnuWin provides Win32-versions of GNU tools, or tools with a similar open source licence. The ports are native ports, relying only on libraries provided with any modern 32-bits MS-Windows operating system, such as 2000 / XP / Vista / 7
The Heirloom Project provides standard Unix utilities.
Windows portable app maker: launcher(s), runtime, and gui designed to help you run non-portable applications in a portable manner.