The DVI-A Single Link M - HD15 VGA F Monitor Adaptor uses the analog signals from the DVI connector for use with a VGA monitor.

DVI-D 25 pin female to HDMI 19 pin male adaptor for converting HDMI device signals into DVI-D, audio is not carried via the DVI-D connector.

The DVI-D Dual Link M - HDMI F Black adaptor uses the digital signals from the the DVI-D connector for HDMI use.

The DVI-D splitter cable is for splitting one DVI-D signal to two DVI-D outputs.  While the outputs use two DVI-I female connectors it only carries the DVI-D signal from the source.

DVI-I Dual link gender changer for connecting two male DVI cables.

The DVI-A Single Link F - HD15 VGA M Monitor Adaptor is the reverse version of the DVI-A to VGA adaptor, it uses the analog signals from the VGA port for use on a DVI-I monitor.