  We present the open source few-body gravity integration toolkit {\tt
SpaceHub}. {\tt SpaceHub} offers a variety of algorithmic methods, including
the unique algorithms AR-Radau, AR-Sym6, AR-ABITS and AR-chain$^+$ which we
show out-perform other methods in the literature and allow for fast, precise
and accurate computations to deal with few-body problems ranging from
interacting black holes to planetary dynamics. We show that AR-Sym6 and
AR-chain$^+$, with algorithmic regularization, chain algorithm, active
round-off error compensation and a symplectic kernel implementation, are the
fastest and most accurate algorithms to treat black hole dynamics with extreme
mass ratios, extreme eccentricities and very close encounters. AR-Radau, the
first regularized Radau integrator with round off error control down to 64 bits
floating point machine precision, has the ability to handle extremely eccentric
orbits and close approaches in long-term integrations. AR-ABITS, a bit
efficient arbitrary precision method, achieves any precision with the least CPU
cost compared to other open source arbitrary precision few-body codes. With the
implementation of deep numerical and code optimization, these new algorithms in
{\tt SpaceHub} prove superior to other popular high precision few-body codes in
terms of performance, accuracy and speed.
