This is a draft of proposals for the Red Edition (data structures) of R7RS-large. For other dockets, see WG2Dockets.
List library: SRFI 1.
Comparators: SRFI 114.
Boxes: SRFI 111.
Sets and bags: SRFI 113.
Integer sets: IntegerSetsCowan.
Character sets: SRFI 14.
List queues: SRFI 117.
Immutable deques, sets, and maps: ImmutableDataStructuresWortman.
Immutable pairs and lists: SRFI 116.
Hash tables and bimaps: HashTablesCowan.
Lazy sequences: LazySequencesCowan.
Immutable cyclic lists: CyclesMedernach.
Binary heaps: BinaryHeapsCowan.
Enumerations with sets and maps: EnumsCowan
Extended records: http://srfi.schemers.org/srfi-99/srfi-99.html.
Multidimensional general arrays: ArraysCowan.
Sparse vectors and maps: Gauche util.sparse.
Ternary search trees: No API proposal yet, but see Wikipedia.
Gap buffers: BuffersCowan (based on Emacs Lisp)