This problem seems to be specific to certain color depths. Try changing your color depth to a different value.
Visit Joe Gross's excellent procmail tutorial at http://www.stimpy.net/procmail/tutorial/.
Yes! There are numerous clones available (not to mention Mirabilis' java version, which is not very good). See http://www.portup.com/~gyandl/icq/.
Netmeeting uses H.323 for audio conferencing, and there is work to develop a free implementation at Open H.323. They have some source/binaries available, and people have used them to successfully talk to NetMeeting 3.0. Unfortunately, Microsoft used a proprietary system for the video.
Word Perfect, Star Office, ApplixWare, LyX, KOffice.
Star Office, ApplixWare, KOffice, Gnumeric.
A good starting point is either http://freshmeat.net/ or http://www.linuxapps.com/.