Pentaho data integration is one of open source tool provided by pentaho suit.
Spoon is used to create transformation using GUI interface.
if you simply want to run the transformations and jobs then use kitchen or spoon. (mainly used for running this things using command line)
saiku is a 1 of server, pentaho itself has a server (pentaho bi server) and in this you can add saiku pluggin for displaying cubes which are designed in pentaho schema workbench.
for more understanding google the terms which i mansion in the answer.