LinuxQuestions.org had a survey titled "Best OpenSource Software 2003", and
here are the results:
Browser ? Mozilla Firebird (38.31%)
Distribution ? Slackware (26.34%)
Database ? MySQL (36.45%)
Desktop Environment ? KDE (55.93%)
Office Suite ? OpenOffice.org (79.51%)
Word Processor ? swriter (OpenOffice.org) (66.86%)
Spreadsheet ? scalc (OpenOffice.org) (54.30%)
Window Manager ? Fluxbox (28.42%)
Multimedia Application ? mplayer (44.61%)
Cryptography App ? OpenSSH (58.71%)
Web Development Editor ? Quanta (49.26%)
Mail Client ? Evolution (28.05%)
Editor ? vi/vim (38.30%)
Hardening App ? Bastille (60.49%)
Open Source Game ? Frozen Bubble (40.73%)
Commercial Game ? Unreal Tournament 2003 (36.75%)
Windows on Linux App ? Wine (36.42%)
Security App ? nmap (56.45%)
FTP Server ? ProFTPD (45.74%)
Web Server ? Apache (93.56%)
MTA ? PostFix (45.52%)