You can use GeoGebra to draw prisms and calculate the volume of those prisms. 
     GeoGebra Instruction 1
3D Graphics Algebra     View     and         Graphics     View     under         View     in         Menu.         Graphics     View.         You         can         read         more         on         how         to         draw         a         rectangle         from         GeoGebra     Instruction         3         here.         Graphics     View     and         open         3D     Graphics     under         View     in         Menu.         Extrude     to     Prism,         which         you         find         by         clicking         on         the         ninth         tool         on         the         Toolbar     (Pyramid)         and         select         the         fourth         tool         from         that         list.         The prism is now drawn in 3D Graphics. The volume of the prism is shown in Algebra View.