T P Uschanov’s links page on Wittgenstein includes his list of Wittgenstein Scholars and Wittgensteinian Thinkers. Comments following a name are Uschanov’s, not mine. Please note: some of the links are not working.
Michael A. R. Biggs The world’s number one expert on the graphics in Wittgenstein’s writings.
Jacques Bouveresse Professor at the Collège de France and a partisan of Wittgenstein in Francophone lands.
Nick Gier The author of Wittgenstein and Phenomenology.
Lars Hertzberg A Finnish Wittgensteinian influenced by Norman Malcolm and Peter Winch.
Dale Jacquette The author of Wittgenstein’s Thought in Transition and many papers on Wittgenstein.
Colin Koopman Many essays available here.
Andrew Lilico He has several exegetical essays available.
Gert-Jan C. Lokhorst He has available several essays on the Tractatus and its logic.
C. Grant Luckhardt The co-translator of many of Wittgenstein’s more recent posthumous publications.
José Oscar de Almeida Marques Brazilian Wittgensteinian who has his doctoral thesis and several papers on-line.
J. C. Nyíri A Hungarian philosopher famous for his researches on Wittgenstein and conservatism.
Denis Paul The co-translator of On Certainty has recently written several papers on Wittgenstein’s unpublished writings.
D. Z. Phillips The most widely-read Wittgensteinian philosopher of religion for over thirty years.
Hilary Putnam He seems to be getting more Wittgensteinian every year.
David G. Stern The author of the contemporary classic Wittgenstein on Mind and Language, and an expert on Wittgenstein’s Nachlass.