SciTE4AutoHotkey is a free, SciTE-based AutoHotkey script editor. v3 is the next generation of SciTE4AutoHotkey. It provides the following functionality:

• Syntax highlighting
• AutoIndent
• AutoComplete
• Calltips (also known as IntelliSense)
• Code folding
• Custom toolbar
• Tools for AutoHotkey scripting

Based on PhiLho's AutoHotkey lexer for Scintilla, this provides a great script editor for both newbies and experienced AutoHotkey users.

Support topic on the AutoHotkey forum: link