Additional debugging features are supported via DBGp, a common debugger protocol for languages and debugger UI communication. See Interactive Debugging for more details. Some UIs or "clients" known to be compatible with AutoHotkey are listed on this page:
SciTE4AutoHotkey is a free, SciTE-based AutoHotkey script editor. In addition to DBGp support, it provides syntax highlighting, calltips/parameter info and auto-complete for AutoHotkey, and other useful editing features and scripting tools.
Debugging features include:
The vscode-autohotkey-debug extension enables Visual Studio Code to act as a debugger client for AutoHotkey. The extension has support for all basic debugging features as well as some more advanced features, such as breakpoint directives (as comments) and conditional breakpoints.
XDebugClient is a simple open-source front-end DBGp client based on the .NET Framework 2.0. XDebugClient was originally designed for PHP with Xdebug, but a custom build compatible with AutoHotkey is available below.
Download: Binary; Source Code (also see SharpDevelop, Dockpanel Suite and Advanced TreeView.)
A DBGp client is available as a plugin for Notepad++ 32-bit. It is designed for PHP, but also works with AutoHotkey. The plugin has not been updated since 2012, and is not available for Notepad++ 64-bit.
Download: See DBGp plugin for Notepad++.
Note: File Mapping must be configured. Most users will not be debugging remotely, and therefore may simply put a checkmark next to Bypass all mapping (local windows setup).
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A script-based DBGp library and example clients are available from GitHub.
GitHub: Lexikos / dbgp
The DebugVars script provides a graphical user interface for inspecting and changing the contents of variables and objects in any running script (except compiled scripts). It also serves as a demonstration of the dbgp.ahk library.
GitHub: Lexikos / DebugVars
A command-line client is available from xdebug.org, however this is not suitable for most users as it requires a decent understanding of DBGp (the protocol).
A number of other DBGp clients are available, but have not been tested with AutoHotkey. For a list, see Xdebug: Documentation.