Table 1: Part of the HeapLayers library, divided by category.
| Top Heaps | ||
| mallocHeap | A thin layer over malloc | |
| mmapHeap | A thin layer over the virtual memory manager | |
| sbrkHeap | A thin layer over sbrk (contiguous memory) Building-Block Heaps | |
| AdaptHeap | Adapts data structures for use as a heap | |
| BoundedFreelistHeap | A free list with a bound on length | |
| ChunkHeap | Manages memory in chunks of a given size | |
| CoalesceHeap | Performs coalescing and splitting | |
| FreelistHeap | A free list (caches freed objects) | |
| Combining Heaps | ||
| HybridHeap | Uses one heap for small objects and another for large objects | |
| SegHeap | A general segregated fits allocator | |
| StrictSegHeap | A strict segregated fits allocator | |
| Utility Layers | ||
| ANSIWrapper | Provides ANSI-malloc compliance | |
| DebugHeap | Checks for a variety of allocation errors | |
| LockedHeap | Code-locks a heap for thread safety | |
| PerClassHeap | Uses a heap as a per-class allocator | |
| PHOThreadHeap | A private heaps with ownership allocator [5] | |
| ProfileHeap | Collects and outputs fragmentation statistics | |
| ThreadHeap | A pure private heaps allocator [5] | |
| ExceptionHeap | Throws an exception when the parent heap is out of memory | |
| TraceHeap | Outputs a trace of allocations | |
| UniqueHeap | A heap type that refers to one heap object | |
| Object Representation | ||
| CoalesceableHeap | Provides support for coalescing | |
| SizeHeap | Records object sizes in a header | |
| Special-Purpose Heaps | ||
| ObstackHeap | A heap optimized for stack-like behavior and fast resizing | |
| ZoneHeap | A zone ("region") allocator | |
| XallocHeap | A heap optimized for stack-like behavior | |
| General-Purpose Heaps | ||
| KingsleyHeap | Fast but high fragmentation | |
| LeaHeap | Not quite as fast but low fragmentation |
