After his 65th birthday, from 1991-2011, fourteen volumes on the Aṣṭādhyāyī of Pāṇini appeared with the Sahitya Akademi in New Delhi.
Authors: S.D. Joshi and J.A.F. Roodbergen.
Vol. fifteen in the series, prepared by J.A.F. Roodbergen alone (and dedicated to S.D. Joshi), appeared in Pune at the Vaidika Samshodhana Mandala in 2011.
Other supplements to the 1991 list of publications (articles by him, by him together with P. Kiparsky and by him together with J.A.F. Roodbergen) can be found in the section “References” in A Dictionary of Pāṇinian Grammatical Terminology (by J.A.F. Roodbergen), Pune: Bhandarkar Oriental Research Institute, 2008.
See also: J.A.F. Roodbergen, “Suppl[e]ment to Dictionary of Pāṇinian Grammatical Terminology” in Annals of the Bhandarkar Oriental Research Institute, vol. 90 (for 2009): 127-151.
One of his last public speeches was probably his Keynote
Address in January 2009 at the Third International Computational Linguistics Symposium in Hyderabad (see “Background of the Aṣṭādhyāyī” p. 1-5 in Sanskrit Computational Linguistics : Third International Symposium, Hyderabad, India, January 2009, Proceedings, Lecture Notes in Artificial Intelligence 5406, ed. by Amba Kulkarni and Gérard Huet, Heidelberg: Springer Verlag, 2009).