This portal talks about programming languages. Technical language is used.
For programming applications, see here.
Note: GTK, QT are not languages, they are gui toolkits.
FreeBasic (libfreebasic already packaged, fbc not yet. Very Microsoft QBasic compatible (graphics))
C / C++
openf95 (from Open64.net, not yet packaged)
gobjc (from GCC)
OCaml (i.e. Objective Caml)
C# and .NET
Mono - open source implementation of Microsoft's .NET Framework (mono)
Vala - self-hosting and statically typed language with C#-like syntax that compiles to C, based on GLib and GObject, useful with GTK+ and GNOME (valac)