Here is a list of GC language that provide capabilities to handle allocations outside GC heap,

Mesa/Cedar, Modula-2+, Modula-3, Oberon, Oberon-07, Oberon-2, Active Oberon, Zonnon, D, Nim, C#, VB.NET, F#, Standard ML (with MLKit), Eiffel, Swift.

Just the list I tend to keep in mind, there are quite a few others.