BatteryAmnesia 1.5.2 (by Jeremy Kezer)
BatteryAmnesia is a utility for any PowerBook that uses a nickel-cadmium(NiCad) battery or Nickel-Hydride (NiMH) battery.

Jeremys CSM 2.1.7 (by Jeremy Kezer)
Jeremy's Control Strip Modules is a set of control stip modules including, Clock, Sound Volume, Sleep, Battery Time, CPU Sleep, Battery, Temperature, Appletalk, Application, Energy Strip, and Power Countdown.

MyBattery 3.3.8 (by Jeremy Kezer)
MyBattery is a utility program designed specifically for PowerBooks.

ClockSync II 1.4.1 (by Jeremy Kezer)
ClockSync II is a simple utility to synchronize the clock of your Macintoshes.

Net Chronometer 1.4.8 (by Jeremy Kezer)
Net Chronometer will synchronize the date and time of your Macintosh with a highly accurate network time server over the internet.

Insomniac 1.1.1 (by Jeremy Kezer)
Insomniac is a utility program designed specifically for any Macintosh that is able to "wake" itself up (currently, any PCI-based Macintosh and the PowerBook 100, 150, PowerBook Duo series, PowerBook 500 series, PowerBook1400, and PowerBook 5300 series).

PowerSaver Tweak 1.1.1 (by Jeremy Kezer)
PowerSaver Tweak is a utility for newer PowerBook models and PCI-based Power Macintoshes that gives you more control over the power conservation settings than Apple's PowerBook/Energy Saver control panel.

ShadowKeys 1.2.1 (by Opus Software)
The extension ShadowKeys provides missing keys for Apple USB Keyboard and iBook or PowerBook built-in keyboard, and other Macintosh or PowerBook with an ADB keyboard.

Apple PowerBook G4 Graphics Update 1.0 (by Apple)
Apple PowerBook G4 Graphics Update improves graphics stability for some 1.

Apple Aluminum PowerBook 15 1.1 (by Apple)
The PowerBook G4 Battery Updater improves the performance of batteries that may develop short run times.

DiskGuard 2.1 (by Intego)
Nearly all Macintosh users are confronted daily with security problems.

Apple PowerBook 15" Battery Updater 1.0 (by Apple)
Apple PowerBook 15" Battery Updater improves the performance of batteries that may develop short run times.

Snood SpeakEasy 0.98 (by Joris de Beer)
There has been a long running thread on MacNN about using a Powerbook as an MP3 player.

Temperox 1.0b3 (by Omid Pajuhideh)
Monitors easy and simple the Temperature of your PowerBook / iBook.

MultiAlarm 3.4.2 (by semaja2)
Have you ever left your iBook/PowerBook on your desk and walked away and turn around to see someone taking your iBook/PowerBook and using it? Well, this application will annoy those that do and alert you.

LoginHelper 3.1 (by Kewl Beans Software)

You Control 1.4.2 (by You Software)
You Control is a flexible menu utility that allows users to put commonly used items, including files and folders, at your fingertips.

Indigo 2.0 (by Perceptive Automation, LLC.)
Indigo is a home control server that integrates X10 hardware devices.

Tiger Cache Cleaner 3.2.4 (by Northern Softworks)
Panther Cache Cleaner is a utility designed to provide easy access to numerous OS X maintenance and utility options.

DesktopSweeper 1.0 (by Philippe Martin)
DesktopSweeper is a freeware APE Module (the equivalent of Unsanity's Haxies) that provides a hotkey to control whether or not Desktop icons are displayed.