There are two Office
alternatives, both of which are complete, work fine and allow you to both open MS Office documents, spread sheets and the like, work on them and save them back as MS Office files or as OpenDocument files. These are LibreOffice
Over the past year or two there has been a great deal of controversy resulting from Oracle's purchase of Sun Microsystems -- years ago Sun bought what was then StarOffice, put together a team that improved StartOffice ultimately releasing it as OpenOffice (open source and free to download and use). When Oracle bought Sun the OpenOffice developers spun off OpenOffice to LibreOffice on their own over concern about what Oracle would do with OpenOffice (Oracle has a well-earned reputation for doing naughty things with open source software among other things). LibreOffice was and still is in many ways OpenOffice although some differences have crept in.
In the meantime, Oracle gave (or sold for a dollar or whatever) OpenOffice to the Apache Foundation and Apache has been allocating resources to OpenOffice, improving it, adding function and the like (LibreOffice has been doing the same thing). Oracle also acquired Java with the Sun purchase and what's going to happen with Java is still up in the air; but that's another story.
For me, I don't have the skill to create templates for use with Writer, the document program in LibreOffice and OpenOffice, the functional equivalent of MS Word. I can do a lot of stuff, but templates are just beyond the blue event horizon for me. So, I rely on a wide range of templates for creating documents, presentations and other tasks. OpenOffice had and still has a plethora of templates, LibreOffice did not initially but has increased both the number and usefulness of available templates. Simply because of that I have been inclined to stick with OpenOffice along with a certain faith in the Apache Foundation for the long haul. I sort of suspect that there will be a merger of OpenOffice and LibreOffice somewhere down the road (now that those rascally boys and girls at Oracle are out of the picture); maybe, maybe not but it does make economic sense.
You can, in fact, try them both and see which one you like. You may not be aware of SlackBuilds.org (http://www.slackbuilds.org
) but that's where you get... uh, a huge selection, one might say, of applications, utilities, libraries and other software that you can quickly and easily build and install in your Slackware system(s). There are instructions there for how to install and use both OpenOffice and LibreOffice at the same time.
If, like me, you rely heavily on templates, you might want to install both and try out the available templates for each (many are the same but there are a bunch unique to one or the other) and see which of the two best fit your needs.
Hope this helps some.