Nano Text Editor
Simply put the executable into your /usr/bin directory.
Note: it is a universal binary:
file nano nano: Mach-O fat file with 2 architectures nano (for architecture i386): Mach-O executable i386 nano (for architecture ppc): Mach-O executable ppc
To make it smaller, you can run
lipo -thin i386 nano -output nano.i386
Then the sizes are:
universal: 231480 i386 only: 107572