SpeedUpMyPC v2.04 - a program for increasing speed of your PC. SpeedUpMyPC increases speed of even most powerful systems. It automatically determines the best settings of your computer and controls system resources, providing best performance. SpeedUpMyPC can also clean your system, control resources usage and increase performance.
Download SpeedUpMyPC v2.04 here for free

WinXP Manager 4.94.1 allows to easily optimize, configure, clean and diagnose Windows XP. WinXP Manager consists of more than 26 different utilities, which are divided into categories: information, optimizing, cleaning, configuring, security, network, other. It also has easy interface.
Download WinXP Manager 4.94.1 for free

TweakMaster Pro 2.05 - a tool for connecting to internet. This program has DNS accelerator and time synchronizer. In TweakMaster Pro there's a feature to measure connection speed. Pro version of this tool also includes DU meter and LinkFox (Internet Explorer accelerator).
Download TweakMaster Pro 2.05 here

PC Adrenalin v.1.0 - real acceleration. PC Adrenalin is a tool for accelerating and optimizing your Windows XP operating system. It has a lot of settings, you can accelerate WinXP by enabling hidden settings or disabling unnecessary services. PC Adrenalin can be configured both automatically or by hand.
Download PC Adrenalin v.1.0 here

WinTools.net Professional 5.5.1 - a pretty good set of tools for increasing Windows' performance. WinTools.net includes: Clean Uninstaller - a tool for clean uninstalling programs; Scan files - a tool for cleaning your system from temporary files and broken links; Scan Registry - a tool for cleaning registry unused and broken keys; Start Up - auto-loader manager; TweakUI - a set of hidden settings and features, which influense the security, performance etc.
Download WinTools.net Professional 5.5.1

WindowsBlinds v.4.51 - a tool for changing interface in Windows 98/Me/NT/2000/XP. WindowsBlinds allows to change almost every interface item in Windows: windows, buttons, etc. In new WindowsBlinds version they added a feature to change skins, Windows 64-bits support, renewed localizations and some other changes.
Download WindowsBlinds v.4.51

X-Setup Pro 7.0 - one of the best tweakers. X-Setup Pro allows you to modify more than 1700 settings (including hidden ones). X-Setup Pro is suitable for every version of windows - from 95 to XP and 2003. It has the feature to set system version specific feature.
All settings are grouped into different groups (windows, office, hardware, internet, network, etc). If existing features are not enough, you can always download new plugins for X-Setup Pro.
Download X-Setup Pro 7.0 here

xp-AntiSpy v3.93 has been updated. xp-AntiSpy allows to remove some unnecessary features of Windows (and all Microsoft software). xp-AntiSpy also allows to tune specified parameters of the system.
Download xp-AntiSpy v3.93 here

Reg Organizer v2.37 - a tool for working with registry. Reg Organizer v2.37 allows to view and edit registry keys, export them. Reg Organizer v2.37 also provides an easy way to view *.reg files directly from explorer. Reg Organizer v2.37 is the replacement for regedit.
Download Reg Organizer v2.37 here

The Tweaking Experience Registry Guide 4.0 - a very useful tool for tweaking windows registry. Tricks and hacks, optimizing, enhancing features and security of the operating system.
Download The Tweaking Experience Registry Guide 4.0 here