EdReg
EdReg is a small freeware program for viewing and manipulating the registry of a PocketPC. Be sure to use EdReg with care, because changes on the registry may have influences on programs and on the operating system, so that for instance programs or other features of your PocketPC won't work anymore.

PHM Registry Editor
The Registry Editor allow you to edit your Pocket PC registry where all its configuration and tweeks are stored.
It allow you to do the following tasks : Explore the registry to find the operating system and applications configuration.

RegEditCe
RegEditCe is a program that displays your Pocket PC's Registry in a tree type explorer. All the elements, even the most basic ones, are shown in the tree. You click on them to display a window that allows you to make changes.

RegKing
RegKing is the ultimate registry hacking tool! Registry "hacks" are little-known settings and tricks that you can use to improve the performance of your Pocket PC. ("Registry" refers to a database of system settings used by all versions of the Windows operating systems.)

TRE Pocket PC
This is a registry editor program such as Windows 95 one. Edit registries at your own risk. The program supports importing of REG files.