ApplixWare , now called Anywhere Office
A Finnish repackaging of OpenOffice.org . There appear to be both proprietary and free software versions available from them.
Another bundling of OpenOffice.org.
WordPerfect
WordPerfect Version 8 for other platforms introduced a fair degree of support for SGML, which may make WordPerfect a natural fit when trying to translate documents from less portable formats as used by "famous Windows wordprocessing software..."
There are some library issues you may have when installing WordPerfect on newer Linux distributions due to it needing older libraries that are often no longer normally distributed. Rick Moen has been asked this enough times that it is becoming a WordPerfect on Linux FAQ.
Axene Xclamation and XAllWrite
Axene appears to no longer be in operation, but you can find source tarballs of Axene products, under GPL terms .
After Angoss spun SmartWare off to a separate company, it seems to have languished, and you may find it challenging to actually obtain copies of the software...
Originally for BeOS , the company has gone out of business. Downloads of installable binaries for PPC and x86 are available at gobe_linux_ppc_install.tgz and gobe_linux_x86_install.tgz
FrameMaker 5.5.6 Beta for Linux
This is one of the most sophisticated document design systems available anywhere; it is likely to be fairly complex to use, suited for complex publishing tasks.
In the end, Adobe didn't decide to continue to make it available.
Led 3.0 / LedIt! WordProcessor uses a multiplatform C++ class library called Led to implement "rich text widgets."