ShowMessage

Small command-line utility for Windows. Can show window with message text, caption and one of free icons - info, warning and error.
Usage
Message with text "Hi there!":
ShowMessage.exe "Hi there!"
Message with text "I will be back." and caption "The Terminator":
ShowMessage.exe "I will be back." "The Terminator"
Message with text "Empire will strike back", caption "Warning from Yoda" and warning icon:
ShowMessage.exe "Empire will strike back" "Warning from Yoda" warning