A collection of 4,000 (nalayiram) verses in honor of Vishnu, composed by the 12 Alwars, sung in 108 Divya Desham. The work was collected and compiled by Nathamuni.
Structure of Nalayira Divya Prabhandam
http://www.srivaishnavam.com/4000total.htm
Parts of Nalayira Divya Prabhandam
https://4000divyaprabandham.wordpress.com/
http://azhwar.org/
http://divyaprabandham.koyil.org/
http://ramanuja-nootrandadi.blogspot.com/
Complete Nalayira Divya Prabandham
https://www.projectmadurai.org/pm_etexts/utf8/pmuni0621_eng.html
The counterpart of Shiva tradition is the Tirumurai.