A group inside ICRN work on the concept of synodality.
International Theological Commission (2018): SYNODALITY IN THE LIFE AND MISSION OF THE CHURCH
ITC (2014): SENSUS FIDEI – IN THE LIFE OF THE CHURCH
Pope Francis (Sept 2018): Episcopalis Communion
Final synod on youth doc — has a lot of guidance on synodality which was controversial among bishops
Upcoming Amazon Synod Preparatory document: AMAZONIA: NEW PATHS FOR THE CHURCH AND FOR AN INTEGRAL ECOLOGY
This is quite good from Massimo Faggioli: From Collegiality to Synodality