What are some alternatives?
When comparing keyboardlayouteditor and Karabiner, you can also consider the following products
HERO Keyboard - The world's most efficient keyboard.
SharpKeys - SharpKeys is a utility that manages a Registry key that allows Windows to remap one key to any...
Key Remapper - Intended for remapping keys, mouse buttons and mouse wheel actions, Key Remapper allows you to:
Typing Speed Test - A simple typing test to see how fast you can type
Key Manager - ATNSOFT Key Manager, Key Remapper, Text Paster
AutoHotkey - Free keyboard macro program. Supports hotkeys for keyboard, mouse, and joystick. Can expand abbreviations as you type them (AutoText).