Here is a list of all files with brief descriptions:

src
soplex
array.h	Save arrays of arbitrary types
basevectors.h	Collection of dense, sparse, and semi-sparse vectors
classarray.h	Save arrays of data objects
classset.h	Set of class objects
clufactor.h	Implementation of sparse LU factorization
clufactor_rational.h	Implementation of sparse LU factorization with Rational precision
cring.h
dataarray.h	Save arrays of data objects
datahashtable.h	Generic hash table for data objects
datakey.h	Entry identifier class for items of a DataSet
dataset.h	Set of data objects
didxset.cpp
didxset.h	Dymnamic index set
dsvector.h	Dynamic sparse vectors
dsvectorbase.h	Dynamic sparse vectors
dvector.h	Dynamic vectors
exceptions.h	Exception classes for SoPlex
git_hash.cpp
idlist.h	Generic Real linked list
idxset.cpp
idxset.h	Set of indices
islist.h	Generic single linked list
lpcol.h	LP column
lpcolbase.h	LP column
lpcolset.h	Set of LP columns
lpcolsetbase.h	Set of LP columns
lprow.h	(In)equality for LPs
lprowbase.h	(In)equality for LPs
lprowset.h	Set of LP columns
lprowsetbase.h	Set of LP columns
mpsinput.cpp	Read MPS format files
mpsinput.h	Read MPS format files
nameset.cpp
nameset.h	Set of strings
notimer.h	NoTimer class
random.h	Random numbers
rational.h	Rational number types
ratrecon.h	Rational reconstruction of solution vector
slinsolver.h	Sparse Linear Solver virtual base class
slinsolver_rational.h	Sparse Linear Solver virtual base class with Rational precision
slufactor.h	Implementation of Sparse Linear Solver
slufactor_rational.cpp
slufactor_rational.h	Implementation of Sparse Linear Solver with Rational precision
sol.h	Types of solution classes
solbase.h	Class for storing a primal-dual solution with basis information
sorter.h	Generic QuickSort implementation
spxalloc.h	Memory allocation routines
spxautopr.h	Auto pricer
spxbasis.h	Simplex basis
spxboundflippingrt.h	Bound flipping ratio test (long step dual) for SoPlex
spxdantzigpr.h	Dantzig pricer
spxdefaultrt.h	Textbook ratio test for SoPlex
spxdefines.cpp	Debugging, floating point type and parameter definitions
spxdefines.h	Debugging, floating point type and parameter definitions
spxdevexpr.h	Devex pricer
spxequilisc.h	LP equilibrium scaling
spxfastrt.h	Fast shifting ratio test
spxfileio.h	Declaration of types for file output
spxgeometsc.h	LP geometric mean scaling
spxgithash.cpp
spxgithash.h	Returns the current git hash of SoPlex
spxharrisrt.h	Harris pricing with shifting
spxhybridpr.h	Hybrid pricer
spxid.cpp
spxid.h	Row and columns Id's SPxLP
spxleastsqsc.h	LP least squares scaling
spxlp.h	Saving LPs in a form suitable for SoPlex
spxlpbase.h	Saving LPs in a form suitable for SoPlex
spxmainsm.h	General methods in LP preprocessing
spxout.cpp
spxout.h	Wrapper for different output streams and verbosity levels
spxpapilo.h
spxparmultpr.h	Partial multiple pricing
spxpricer.h	Abstract pricer base class
spxratiotester.h	Abstract ratio test base class
spxscaler.h	LP scaling base class
spxsimplifier.h	LP simplification base class
spxsolver.h	Main LP solver class
spxstarter.h	SoPlex start basis generation base class
spxsteepexpr.h	Steepest edge pricer with exact initialization of weights
spxsteeppr.h	Steepest edge pricer
spxsumst.h	Simple heuristic SPxStarter
spxvectorst.h	Solution vector based start basis
spxweightpr.h	Weighted pricing
spxweightst.h	Weighted start basis
ssvector.h	Semi sparse vector
ssvectorbase.h	Semi sparse vector
stablesum.h
statistics.h	Class for collecting statistical information
svector.h	Sparse vectors
svectorbase.h	Sparse vectors
svset.h	Set of sparse vectors
svsetbase.h	Set of sparse vectors
timer.h	Timer class
timerfactory.h	TimerFactory class
unitvector.h	Sparse vector \(e_i\)
unitvectorbase.h
updatevector.h	Dense VectorBase<R> with semi-sparse VectorBase<R> for updates
usertimer.cpp
usertimer.h	UserTimer class
validation.h	Validation object for soplex solutions
vector.h	Dense vector for linear algebra
vectorbase.h	Dense vector
wallclocktimer.cpp
wallclocktimer.h	WallclockTimer class
example.cpp	Simple example of how to build up and solve an lp using the SoPlex callable library
soplex.h	Preconfigured SoPlex LP solver
soplex_interface.cpp
soplex_interface.h
soplexmain.cpp	Command line interface of SoPlex LP solver
soplex-vectors_overview.cpp
xternal.cpp	SoPlex documentation pages