download AllegroCL if you want a GUI Builder. SLIMe doesns't have a GUI but is pretty good tooling. has Autocomplete according to symbols available to your ima

download AllegroCL if you want a GUI Builder. SLIMe doesns't have a GUI but is pretty good tooling. has Autocomplete according to symbols available to your image out of the box, xref (who calls function/who setsvariable/etc), a menu for managing threads, an object inspector and much more.