I was thinking in use LCL as GUI for Go programs...
Just to clarify something: the LCL is a collection of classes etc., many of which have RTTI (Run-Time Type Information); it is not in itself an IDE.
Lazarus is the corresponding IDE, which relies on RTTI etc. provided by the LCL.
Some brave souls drive the LCL directly without using the Lazarus IDE's RAD facilities (i.e. the form designer etc.), but basically the Lazarus IDE, LCL and Object Pascal (plus obviously things like the debugger) are deeply interdependent.
I think what you're really asking is where can you find an IDE that supports Go, and offers something approaching the richness of the Lazarus+LCL RAD combination. As others have said, that really is something which you'd be better discussing with the Go community (or, for that matter, any other self-styled "modern language" community): if they have nothing comparable to offer I assure you that I sympathise.
MarkMLl