http://www.maths.mq.edu.au/~steffen/
I'm a maintainer for Macintosh related code in Tcl and Tk (see TIPs 24 [L1 ] and 30 [L2 ]), and have ported/updated a number of standard Tcl extensions to the Mac.
I've also put together the latest Mac Tcl/Tk releases (since 8.3.2p1).
I'm part of the team developing the next generation of the mac text editor Alpha and its Tcl library AlphaTcl (c.f. [L3 ]).
Links to some resources I'm involved with:
Mac Tcl/Tk resources:
Public Alpha & AlphaTcl resources: