What are some alternatives?
When comparing keyboardlayouteditor and SharpKeys, you can also consider the following products
HERO Keyboard - The world's most efficient keyboard.
Karabiner - Karabiner, previously called KeyRemap4MacBook, is a very powerful keyboard remapper for Mac OS X.
Typing Speed Test - A simple typing test to see how fast you can type
Key Remapper - Intended for remapping keys, mouse buttons and mouse wheel actions, Key Remapper allows you to:
Key Manager - ATNSOFT Key Manager, Key Remapper, Text Paster
Microsoft keyboard layout creator - Edit the windows keyboard layout.