Here are the data structures with brief descriptions:

C_big_int	Store arbitratily large integer values as a linked list of digits
C_cantor_set	Structure to define Cantor set
C_large_num	Dynamically large number
Cadaline	Structure to hold adaline model parameters
CAVLnode
CBSTIterator	Definition for a binary tree node
Cbuffer	Struct used to store character in certain times
CCArray
Ccluster
Cdata
CDict
Cdual_quat_	Dual quaternion type
Cdynamic_array
CEdge
Celem
Ceuler_	3D Euler or Tait-Bryan angles (in radian)
CGraph
CGraphRep
Chash_set_t
Ckohonen_array_3d	To store info regarding 3D arrays
CL
Clist	Doubly linked list struct
Cmat_3x3_	A 3x3 Matrix type definition
Cmax_heap	For INT_MIN
CMEMORY_INFORMATION	For the malloc, calloc and free functions
Cmin_heap
Cnode	Node, the basic data structure in the tree
CNode	Node, the basic data structure of the tree
Cobservation
Cpid	PID Controller
Cquaternion_	Quaternion type represented using a scalar \(w\) or \(q_0\) and a 3D vector \(\left(q_1,q_2,q_3\right)\)
Cqueue
CQueueRep
Csegment_tree	This structures holds all the data that is required by a segment tree
CStack	For printf() and scanf()
Csubset
Csudoku	Structure to hold the matrix and dimensions
CT
Cterm	Identifier for single-variable polynomial coefficients as a linked list
Ctnode
Ctrie
Cvec_3d_	3D vector type
Cword_count_word