Songs written and composed by Chanyeol :

Run
Promise (kor)
Lightsaber
Heaven
Do It Together
Ko Ko Bop
Chill
Sweet Lies
Hand
Gravity
With You
Love Shot
Trauma
What A Life
Just us 2
Roller Coaster
Borderline
Daydreamin'
Closer To You

Confession (for/with Kai), Freal Luv (his part), Don't make money from unpretty rapstar, Sehun's dance break at EXplOration stage, SBS Power FM 20th anniversary logo song by EXO and many more... including songs done in NNG

Apart from these, there are songs he has worked on as song writer and composer for others and many are uploaded by him (written/composed/sung by CY) onto his soundcloud account.

Follow his soundcloud : http://m.soundcloud.com/realpcysc 
NGG studio: https://www.youtube.com/channel/UCR4vlBiZ4Ua8Uzm9z91Qn1g