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We present a Fortran 95 code for simulating the evolution of astrophysicalsystems using particles to represent the underlying fluid flow. The code isdesigned to be versatile, flexible and extensible, with modular options thatcan be selected either at compile time or at run time. We include a number ofgeneral purpose modules describing a variety of physical processes commonlyrequired in the astrophysical community. The code can be used as an N-body codeto evolve a set of particles in two or three dimensions using either a Leapfrogor Runge-Kutta-Fehlberg integrator, with or without individual timesteps foreach particle. Particles may interact gravitationally as $N$-body particles,and all or any subset may also interact hydrodynamically, using the SmoothedParticle Hydrodynamic (SPH) method. Massive point particles (`stars') which mayaccrete nearby SPH or $N$-body particles may also be included. The default freeboundary conditions can be replaced by a module to include periodic boundaries.Cosmological expansion may also be included. An interface with special purpose`GRAPE' hardware may also be selected. If available, forces obtained from theGRAPE coprocessors may be transparently substituted for those obtained from thedefault tree based calculation. The code may be run without modification onsingle processors or in parallel using OpenMP compiler directives on largescale, shared memory parallel machines. In comparison to the Gadget-2 code ofSpringel 2005, the gravitational force calculation is $\approx 3.5 - 4.8$ timesfaster with VINE when run on 8 Itanium~2 processors in an SGI Altix, whileproducing nearly identical outcomes in our test problems. We presentsimulations of several test problems, including a merger simulation of twoelliptical galaxies with 8 particles.

VINE -- A numerical code for simulating astrophysical systems using particles I: Description of the physics and the numerical methods