Updated: 12/29/2005
Tweaks
!!Tweak
[Report a dead link]

Cacheman , Cacheman.zip
Tweak Win 95/98 disk cache. [Report a dead link]

CacheSpeed
Tweak your cache and RAM settings to make your PC faster. [Report a dead link]
http://www.roadside-software.com/

Fresh UI
Tweak lots of system settings. For XP, NT4, 2000, 98, 95, ME. [Report a dead link]
http://www.freshdiagnose.com/

Tweak ALL , Tweakall.exe, 4,220kb , Rating: 5
Win 9x. FREE. Tweaks many settings for windows 95/98 all in one program. [Report a dead link]
http://www.codeforge.co.uk

Tweak2000
From MS. Compatible with Win 9x/2000/NT. [Report a dead link]
http://www.windows-help.net/windows98/tweakui2000.shtml

Tweak3d
This is a website about tweaking, but should have some tweak programs there. [Report a dead link]
http://www.tweak3d.net/tweak/win2k/

TweakUI
From Microsoft. Tweak some system settings. Other utils are better than this. [Report a dead link]
http://www.microsoft.com/ntworkstation/downloads/PowerToys/ Networking/NTTweakUI.asp