I use Coda as if it were an editor, though I guess you could call it a “light” IDE. It does create “sites” and organize files into sites, preview scripted languages (no compiling) and has an ftp upload built in.
Was it simply not mentioned, i.e. not popular with Ruby programmers, or was it ruled out as an IDE? I know it has a decent following and is commonly compared to Sublime Text in arguments among Coda users over which editor is best.
–Kenoli