WinCompose - WinCompose supports the standard Compose file format.
Free Virtual Keyboard - Free Virtual Keyboard is a free, lightweight, multilingual and finger friendly virtual keyboard.
PopChar - The character map that works!
Hot Virtual Keyboard - A replacement for Windows' built in virtual touch keyboard.
BabelMap - Unicode Character Map for Windows
Neo's SafeKeys - Home to Neo's SafeKeys - protection from keyloggers.