The NUpowr G3 series of upgrade cards were for the PowerBook 1400 and 2400 series computers.

Native Instruments Audio 4 DJ - USB Sound Card - Drivers 2.3.14 for OS X Tiger - PPC

The NTFS-3G driver is an open source, freely available read/write NTFS driver available on all major OS'es. NTFS-3G is open source and is available on GitHub  

This is the pre-internet era NIC board with no software is able to be found anywhere. However, I've managed to get a resource fork with working driver from the original System image. The driver stores in enet section. It has to be copied...

this is NuPower® Cache 1.2

this is the NuPower System Update

Disk images are in dc42  format. Works with emulators and Floppy Emu. From the VintageMicros collection.

NudgeMouser 2 helps you use your mouse.  It lets you move the mouse very precisely, using either the cursor keys or the numeric keypad.  With NudgeMouser 2, you can also change many of settings via a Control Panel.  

NavigateFolder is a contextual menu plug-in that works for MacOS 8 and later. Control-Click a folder or volume icon in the Finder, and you will have access to the subdirectories and files contained in it, by choosing them from a hierarchical...

NortonFix will repair HFS+, Mac OS Extended, volumes corrupted by Norton Utilities.  You should always run Apple's "Disk First Aid" utility in conjunction with NortonFix for a more complete verification and repair. 

NetChronometer will synchronize the date and time of your Macintosh with a highly accurate network time server over the internet. You can even set up NetChronometer to synchronize with the time server periodically, for unattended operation.