Alternative to Abiword, LibreOffice or Open Office under Linux
Solution 1:
Take a look at LyX, it's my favorite writing tool ever, and I think I've tried them all. It's easy to learn too.
Solution 2:
Did you have a look at KOffice? It also has a word processor.
However, if the problem with Abiword is stability, did you consider just downgrading to the version you used before? Might require a bit of fiddling to the library versions right (or at worst, a recompile), but there's no reason you can't continue using the old version.
Solution 3:
I am not familiar with Linux enough to give you a specific recommendation, but when it comes to software alternatives, I always check in this site:
AbiWord linux alternatives: http://alternativeto.net/software/abiword/?profile=linux&platform=linux
AbiWord online alternatives: http://alternativeto.net/software/abiword/?profile=linux&platform=online
Hope it helps.
Solution 4:
If you can still run a web browser on these older machines, one solution could be to use Google Docs, or another option like netEditr(I just ran across that one now, I don't know how good it is).