Converting from Albers to GPS coordinates

Converting from Albers to GPS coordinates

I have some coordinate data and the only thing i know about its coordinate
system is the following description:
PROJCS["Basic Albers NAD83",
GEOGCS["GCS_North_American_1983",
DATUM["D_North_American_1983",
SPHEROID["GRS_1980",6378137.0,298.257222101]
],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]
],
PROJECTION["Albers"],
PARAMETER["False_Easting",0.0],
PARAMETER["False_Northing",0.0],
PARAMETER["Central_Meridian",-96.0],
PARAMETER["Standard_Parallel_1",45.5],
PARAMETER["Standard_Parallel_2",29.5],
PARAMETER["Latitude_Of_Origin",23.0],
UNIT["Foot_US",0.3048006096012192]
]
this comes from a prj arcGis file.
I need to convert from this system to GPS (Google maps) system and
vice-versa.
this must be done programatically and i cannot use esri libraries (license
issues)...
Could you explain the meaning of all these parameters?
are the coordinates expressed in the spheroid and the projection (albers)
used only when drawing the map? or the coordinates depend on the
projection used also?
Do you know an open source library I could use for this transformation?
Thanks!