See http://www.sun.com/ for web site.
Sun is known as a hardware company (servers, desktops) but they also do a lot of work in Operating systems (SunOS and Linux), programming languages (Java today, Tcl, C, C++ in the past), and applications (OpenOffice, NFS, NeWS Display Postscript Window System).
From #tcl:
<davidw> *a sun employee*: I didn't think Tcl was that big at sun anymore. *a sun employee* davidw: Tcl may not be big in product development, but it's huge in operations