Some common codecs appear broken
With version 1.3 of Quicktime4Linux creating files with some of the standard formats, such as RGB uncompressed creates movies that become unplayable with tools such as xanim (reports that the clip has no length), although Quicktime for Windows and XMovie seems happy with them.
Version 1.2 does not have this problem.
An open, cross-platform journaling program.
A scientific plotting package.