You have a big list,let me recommend a few:Sethurama Iyer 3,Devasuram(excellent film),gandhinagar 2nd street,lal salaam,perumazhakalam,thalavattom,natturajavu(huge hit)chintavistaya shyamala,thenmavin komabthu(was rehashed as Muthu in Tamil),spadikam,Summer in Bethelam(Remade as Lesa Lesa),Rajavinte Makan(excellent film),Kiluchundam Mambazhlam,Niram(was remade into Tamil starring Prashant&Shalini),Aaram thampuran,Nizhalakuthu,Chronic Bachelor(remade as Engal Anna in Tamil with Vijaykanth),Boothakannadi,Lelam,