I still use OPENSTEP and nowadays Mac OS X. As a hobby I maintain my systems, do a bit of porting and development and deliver a bit of support for the Mac OS X community, all of it only for tools I use myself.
For the Mac OS X community he has developed i-Installer, an internet-aware software installer and configuration. He also produces and maintains a TeX distribution for Mac OS X.
Professional work in area of: Foraml specification and verification, Software Engineering, Multimedia, Web Applications Development, Chinese Processing.
Contribution to TeX community: Chinese pinyin package (TUGBoat No. 14(1), 1993) pbmtogf (Converting bitmap to font, available in CTAN) Typesetting rare Chinese Characters in LaTeX (EuroTeX2003)