Overview of released chipsets series
- Intel HD Graphics, a series of processor-based graphics first released in 2010
- Intel Graphics Media Accelerator, a series of integrated graphics released from 2005 to 2008
- Intel Extreme Graphics, a series of integrated graphics released from 2002 to 2003
From Wikipedia's page about Intel graphics (very old and non-available products have been left out)
Requirements for running Unity
The Intel GMA 950 graphics solutions or better are currently recommended for running the Ubuntu Desktop.
Driver updates and documentation
The latest driver packages (be warned that these may cause instabilities), code and documentation can be found at the Intel Open Source Technology Center website.