arith: Arithmetical algorithms like CORDIC and powering.

bits: Bit fiddling routines.

comb: Combinatorial objects like combinations, permutations, Gray codes, partitions and necklaces.

ds: Data structures like FIFO, heap and deque.

fft: Fast Fourier and Walsh transform.

gf2n: Binary polynomials, finite fields GF(2^n) and shift registers.

graph: Searching directed graphs, mostly to find combinatorial objects.

mod: Modular arithmetics and number theory.

perm: Routines for computations with permutations.

seq: Integer sequences by OEIS number, see http://oeis.org/.

sort: Sorting and searching: quick sort, radix sort and binary search.