The poems of the Vaishnavite Azhwars were later compiled as the Nalayira Divya Prabhandam.  

• The Saiva literature was canonized as the Panniru Tirumurai. The Thevaram, composed by Appar (Thirunavukkarasar), Sambandar (Thirugnanasambandar) and Sundarar.  
• And Thiruvavasagam by Manickavasagar are prominent texts which are read as sacred literature to this day.  

• Periyapuranam written by Sekizhar, in a later period, also provides much historical information.  
• The Mathavilasa Prahasanam written by Mahendravarman I in Sanskrit is an important source for the Pallava period. 

Source: Tamil Nadu state board.