Release version: gnu / debian linux, http://www.debian.org
XWindow: gnome http://www.gnome.org
Mail system: thunderbird http://www.mozilla.org
Browser: Firefox http://www.mozilla.org
Office: OpenOffice http://www.openoffice.org
Dictionary: Stardict http://stardict.sourceforge.net/
Instant News: Gaim http://gaim.sourceforge.net/
The GAIM version does not contain the QQ protocol, so my QQ uses GAIM-based OpenQ or separate Lumaqq.
OpenQ: http://sourceforge.net/projects/openq/
Lumaqq: http://lumaqq.linuxsir.org/main/?q=node/18
Viewing tools: gthumb (gnome comes)
Painting flow chart: DIA, but he seems to have become part of GNOME, http://www.gnome.org/projects/dia/
MP3 play: xmms http://www.xmms.org/
Watching movies: mplayer http://www.mplayerhq.hu
BT tool azureus http://azureus.sourceforge.net/
Input method: fcitx http://www.fcitx.org/