Groove metal, also known as "post-thrash", is a genre derived from thrash metal and is represented by bands such as Pantera, Sepultura, Lamb of God. It has the intensity and sound characteristics of thrash metal, but played at a moderate tempo.
Historically the first album considered as groove metal is cowboys from hell in 1990, the arrival of this album was a slap for the metal
Here's my top 10's best groove metal albums
1). Pantera : Cowboys from hell 1990
2). Pantera : Vulgar display of Power 1992
3). Pantera : Reinventing the steel 2000
4). Pantera : Far beyond driven 1994
5). Pantera : The Great Southern Trendkill 1996
6). Black Label Society : The Blessed Hellride 2003
7). Black Label Society : 1919 Eternal 2002
8). Sepultura : Chaos A.D. 1993
9). Suicidal Tendencies : Suicidal for life 1994
10). Suicidal Tendencies : Light camera revolution 1990