Here is a list of all files with brief descriptions:

Application.cc
Application.h
Base.h
BookStore.cc
BookStore.h
BookStoreManager.cc
BookStoreManager.h
CmdLineParser.cc
CmdLineParser.h
Component.cc
Component.h
Condition.cc
Condition.h
Configuration.cc
Configuration.h
CPUCrunchingProcessor.cc
DataSourcePlugin.cc
DataSourcePlugin.h
DD4hepGeometry.cc
Dummy.h
DumpEventProcessor.cc
EmptyGeometry.cc
Entry.h
EntryData.h
EventExtensions.cc
EventExtensions.h
EventSelectorProcessor.cc
EventStore.h
Exceptions.cc
Exceptions.h
Extensions.h
Flags.h
GearGeometry.cc
GeometryManager.cc
GeometryManager.h
GeometryPlugin.cc
GeometryPlugin.h
Handle.h
Hist.h
HistEntry.h
HistEntryData.h
HistEntryDataBase.h
IScheduler.cc
IScheduler.h
jenkinsHash.h
LCIOEventUnpackingProcessor.cc
LCIOFileSource.cc
LCIOOutputProcessor.cc
LoggerManager.cc
LoggerManager.h
Logging.cc
Logging.h
LogicalExpressions.cc
LogicalExpressions.h
MarlinMTBookConfig.h
MarlinMTConfig.h
MemLayout.h
MemoryMonitorProcessor.cc
Parameter.cc
Parameter.h
PEPScheduler.cc
PEPScheduler.h
PluginManager.cc
PluginManager.h
Processor.cc
Processor.h
ProcessorApi.cc
ProcessorApi.h
Queue.h
QueueElement.h
RandomSeedManager.cc
RandomSeedManager.h
ReaderListener.cc
ReaderListener.h
RootHistV7ToV6Conversion.cc
RootHistV7ToV6Conversion.h
ROOTv7.h
RunHeader.h
Selection.cc
Selection.h
Sequence.cc
Sequence.h
SimpleScheduler.cc
SimpleScheduler.h
Statusmonitor.cc
StdHepFileSource.cc
StoreWriter.cc
StoreWriter.h
StoreWriterDummy.cc
TestProcessor.cc
ThreadPool.h
Types.h
Utils.cc
Utils.h
Validator.h
Worker.h
XMLConfigReader.cc
XMLConfigWriter.cc