The SimTK SUNDIALS libraries are an implementation of the 
DOE's SUNDIALS (SUite of Nonlinear and DIfferential/ALgebraic equation Solvers).
URL:http://www.llnl.gov/CASC/sundials/

For more information on  the theory of behind the solvers pdf's can be 
downloaded for the user and examples guides from:
http://www.llnl.gov/CASC/sundials/documentation/documentation.html
 
Note: The SimTK implementation of SUNDIALS does not include the 
N_VEC functionality which uses MPI for using multiple systems in parallel.
This functionality will be added in a future SimTK release. 


SimTK SUNDIALS  consists of following solvers: 

CVODE:  A solver for stiff and nonstiff ODE systems y' = f(t,y),
        with serial and parallel versions.

CVODES: A solver for stiff and non-stiff ODE systems with sensitivity
        analysis capabilities, with serial and parallel versions.

IDA:    A solver for differential-algebraic systems F(t,y,y') = 0, with
        serial and parallel versions.

KINSOL: A solver for nonlinear algebraic systems F(u) = 0, with serial
        and parallel versions.



The SimTK SUNDIALS installation consists of the following directories:

 lib/sundials :     contains shared libraries for each of the solvers.

 doc/sundials :     contains documentation (this file) 

 include/sundials:  contains header files for building applications with SUNDIALS

 examples/sundials: contains Makefile and example programs which show how to use 
                    SUNDIALS